Hey

i have recently upgraded to Duet 2 wifi running in SBC mode (Raspberry Pi 3b, duetPi lite). and I'm slowly wokring my way through a few issues but atm i am having quite a lot of problems with my BlTouch.

it deploys and retracts with M401 and M402 and also worked perfectly before with out any problems .
but after the upgrade the printer hangs when it has to deploy and it hangs when it triggers before then retracting the probe, and sometimes during probing it will then fail and give a "probe already triggered before probing move started"

it seems to happen mostly when running a G29, but also sometimes happens with a G30, that i use to level the x axis, how not observed it when homing z.

my config.g

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Tue Mar 05 2019 15:58:37 GMT+0100 (Centraleuropæisk normaltid)

;3dprint counter
M950 S4 C"duex.pwm2"								  ;heater 7 as servo pin 4
M42 P4 S0											  ; servo pin4 set to low


; General preferences
G90                                                   ; Send absolute coordinates...
M83                                                   ; ...but relative extruder moves

; Network
M550 P"P3sbc"                                         ; Set machine name
M551 P"iasdf"                                         ; Set password
;M552 S1                                              ; Enable network
;M586 P0 S1                                           ; Enable HTTP
;586 P1 S0                                            ; Disable FTP
;586 P2 S0                                            ; Disable Telnet

; Drives
M584 X0 Y8 E1 V3 W7 U9 Z2:4                           ; two Z motors connected to driver outputs Z and E1
M569 P0 S1                                            ; Drive 0 goes forwards 
M569 P1 S0                                            ; Drive 1 goes forwards  
M569 P2 S1                                            ; Drive 2 goes forwards
M569 P3 S1                                            ; Drive 3 goes forwards
M569 P4 S1                                            ; Drive 4 goes forwards
M569 P8 S0                                            ; Drive 8 goes backwards  V
M569 P9 S0                                            ; Drive 9 goes forwards   U
M569 P7 S1                                            ; Drive 7 goes forwards   W

M350 X16 Y16 V16 U16 W16 Z16 E16 I1                                         ; Configure microstepping without interpolation                                                             ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E409.0 U400 V162 W26                          ; Set steps per mm
M566 X300.00 Y300.00 Z36.00 E240.00 U200 V3600 W300                      ; Set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z1200.00 E7200.00 U2600 V7000 W9000           ; Set maximum speeds (mm/min)
M201 X1300.00 Y1300.00 Z120.00 E3000.00 U500 V900 W900                  ; Set accelerations (mm/s^2)
M906 X1500.00 Y1500.00 Z800.00 E1250.00 U750 V1000 W750 I30             ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 				                                                       ; Set idle timeout


;Duel z compensation
M671 X-55:296 Y0:0 S5                                 ; leadscrews at left (connected to Z) and right


; Axis Limits
M208 X-8 Y-5 Z0 U0 V-1000 W0 S1                       ; Set axis minima
M208 X237 Y215 Z200 U75 V1000 W78 S0                  ; Set axis maxima

; Stall detection
M915 X Y U V W S20 R0 F1

; Endstops
M574 X1 Y1 S3                                         ; Set endstops controlled by motor load detection
M574 U2 W1 S3	
M574 Z1 S2                                            ; Set endstops controlled by probe
M574 V1 P"e0stop" S1

;Filament sensor
M591 D0 P1 C"xstop" S0


;led setup
M950 P2 C"e1heat" Q500
M42 P2 I1 S1				                          ; set lighting on full bright


; Z-Probe
M950 S0 C"duex.pwm1"                                  ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H10 F320 T9000                   ; Set Z probe type to bltouch and the dive height + speeds
G31 P900 X-14.65 Y19,29 Z3.24                         ; Set Z probe trigger value, offset and trigger height
M557 X20:222 Y15:215 S30                              ; Define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 A"Bed" ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                                 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 A109.9 C411.9 D9.6 V11.7 B0 S1.00             ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                               ; map heated bed to heater 0
M143 H0 S120                                          ; set temperature limit for heater 0 to 120C
M308 S1 P"spi.cs1" Y"rtd-max31865" A"Hotend"          ; create sensor number 1 as a PT100 sensor in the first position on the Duet 2 daughter board connector
M950 H1 C"e0heat" T1                                  ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 A354.8 C196.4 D4.3 V12 B0 S1.00               ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S400                                          ; Set temperature limit for heater 1 to 400C
M308 S2 Y"drivers" A"Drivers"                         

; Fans
M950 F0 C"fan0" Q500                                  ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 C"Part Cooler"                         ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                                  ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 C"Heatsink Cooler"                  ; set fan 1 value. Thermostatic control is turned on

;Tools
M563 P0 D0 H1                                      ; Define tool 0
G10 P0 X0 Y0 Z0                                    ; Set tool 0 axis offsets
G10 P0 R0 S0                                       ; Set initial tool 0 active and standby temperatures to 0C

M563 P1 D0 H1                                      ; Define tool 1
G10 P1 X0 Y0 Z0	                                   ; Set tool 1 axis offsets
G10 P1 R0 S0                                       ; Set initial tool 1 active and standby temperatures to 0C

M563 P2 D0 H1                                      ; Define tool 2
G10 P2 X0 Y0 Z0                                    ; Set tool 2 axis offsets
G10 P2 R0 S0 					                   ; Set initial tool 2 active and standby temperatures to 0C

M563 P3 D0 H1                                      ; Define tool 3
G10 P3 X0 Y0 Z0                                    ; Set tool 3 axis offsets
G10 P3 R0 S0 					                   ; Set initial tool 3 active and standby temperatures to 0C

M563 P4 D0 H1                                      ; Define tool 4
G10 P4 X0 Y0 Z0                                    ; Set tool 4 axis offsets
G10 P4 R0 S0 					                   ; Set initial tool 4 active and standby temperatures to 0C

;LCD screen setup
M575 P1 S1 B57600

;Global varibels
global purgeLoc = 0	

;retraction setup
;M207 P0 S0.8 F3000 Z0.2								  ;basic Retraction setup

; Automatic saving after power loss is not enabled
; M911 S10.7 R22 P"M913 X0 Y0 G91 M83 G1 Z3 E-1 F1000"

; Custom settings are not configured

T-1 P0

also an M122

M122
=== Diagnostics ===
RepRapFirmware for Duet 2 SBC version 3.3RC1 (2021-05-01 09:58:40) running on Duet 2 1.02 or later + SBC + DueX5 (SBC mode)
Board ID: 08DGM-9T6BU-FG3S8-6J1DJ-3SN6M-1SLBG
Used output buffers: 1 of 24 (24 max)
=== RTOS ===
Static ram: 17420
Dynamic ram: 63480 of which 0 recycled
Never used RAM 30660, free system stack 104 words
Tasks: SBC(resourceWait:,57.5%,297) HEAT(delaying,0.5%,331) Move(notifyWait,2.3%,305) DUEX(notifyWait,0.0%,24) MAIN(running,39.7%,374) IDLE(ready,0.1%,30), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 01:23:27 ago, cause: power up
Last software reset at 2021-05-08 17:13, reason: User, none spinning, available RAM 30660, slot 0
Software reset code 0x0012 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x04
Aux0 errors 0,0,0
Step timer max interval 0
MCU temperature: min 44.9, current 49.4, max 50.4
Supply voltage: min 11.4, current 11.6, max 12.2, under voltage events: 0, over voltage events: 0, power good: yes
Heap OK, handles allocated/used 99/1, heap memory allocated/used/recyclable 2048/140/128, gc cycles 0
Driver 0: position 9723, ok, SG min/max 0/1023
Driver 1: position 8541, ok, SG min/max 0/1023
Driver 2: position 1760, standstill, SG min/max 57/344
Driver 3: position 400, standstill, SG min/max 0/1023
Driver 4: position 1620, standstill, SG min/max 0/333
Driver 5: position 2028, standstill, SG min/max not available
Driver 6: position 0, standstill, SG min/max not available
Driver 7: position 0, standstill, SG min/max 0/846
Driver 8: position 0, ok, SG min/max 0/1023
Driver 9: position 0, standstill, SG min/max 0/1023
Driver 10: position 0
Driver 11: position 0
Date/time: 2021-05-08 18:43:13
Cache data hit count 4294967295
Slowest loop: 735.06ms; fastest: 0.10ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Move ===
DMs created 83, maxWait 535188ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 6335, completed moves 6320, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 1], CDDA state 3
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
Heater 0 is on, I-accum = 0.5
Heater 1 is on, I-accum = 0.7
=== GCodes ===
Segments left: 1
Movement lock held by null
HTTP* is doing "M122" in state(s) 0
Telnet is idle in state(s) 0
File* is doing "G1 X123.866997 Y100.974998 F7800.000000" in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue* is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== Filament sensors ===
Extruder 0 sensor: no filament
=== DueX ===
Read count 1, 0.01 reads/min
=== SBC interface ===
State: 4, failed transfers: 0
Last transfer: 5ms ago
RX/TX seq numbers: 49622/49622
SPI underruns 0, overruns 0
Number of disconnects: 0, IAP RAM available 0x0d08c
Buffer RX/TX: 976/2432-0
=== Duet Control Server ===
Duet Control Server v3.3-rc1
File:
Buffered code: G1 X123.867 Y100.975 F7800.000
Buffered code: G1 F900.000
Buffered code: G1 X113.132 Y100.975 E0.32706
Buffered code: G1 X113.132 Y97.539 E0.10467
Buffered code: G1 X123.867 Y97.539 E0.32706
Buffered code: G1 X123.867 Y100.915 E0.10284
Buffered code: G1 X124.275 Y101.382 F7800.000
Buffered code: G1 F900.000
Buffered code: G1 X112.725 Y101.382 E0.35186
Buffered code: G1 X112.725 Y97.132 E0.12947
Buffered code: G1 X124.275 Y97.132 E0.35186
Buffered code: G1 X124.275 Y101.322 E0.12764
Buffered code: G1 X123.877 Y101.335 F7800.000
Buffered code: G1 X114.487 Y98.068
Buffered code: G1 F2100.000
Buffered code: G1 X113.844 Y98.711 E0.02781
Buffered code: G1 X113.844 Y99.289 E0.01767
Buffered code: G1 X114.882 Y98.252 E0.04488
Buffered code: G1 X115.460 Y98.252 E0.01767
Buffered code: G1 X113.844 Y99.867 E0.06987
Buffered code: G1 X113.844 Y100.263 E0.01210
Buffered code: G1 X114.026 Y100.263 E0.00558
Buffered code: G1 X116.037 Y98.252 E0.08698
Buffered code: G1 X116.615 Y98.252 E0.01767
Buffered code: G1 X114.604 Y100.263 E0.08698
Buffered code: G1 X115.182 Y100.263 E0.01767
Buffered code: G1 X117.193 Y98.252 E0.08698
Buffered code: G1 X117.771 Y98.252 E0.01767
Buffered code: G1 X115.760 Y100.263 E0.08698
Buffered code: G1 X116.338 Y100.263 E0.01767
Buffered code: G1 X118.349 Y98.252 E0.08698
Buffered code: G1 X118.927 Y98.252 E0.01767
==> 1480 bytes
Code buffer space: 1664
Configured SPI speed: 8000000 Hz
Full transfers per second: 35.70
Codes per second: 6.35
Maximum length of RX/TX data transfers: 3808/1580
File /opt/dsf/sd/gcodes/s-buffer-spacer.gcode is selected, processing

a mixing extruder might be the way forward.
if i can figure out how to work it into my config.

i have attached my config and all the macros for Tool 0
the other tools 1-4 is the same only having the selector positions different.

its still a WIP and there is much more to at. but its what i got atm.

Config.g

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Tue Mar 05 2019 15:58:37 GMT+0100 (Centraleuropæisk normaltid)

;3dprint counter
M950 S4 C"duex.pwm2"								  ;heater 7 as servo pin 4
M42 P4 S0											  ; servo pin4 set to low


; General preferences
G90                                                   ; Send absolute coordinates...
M83                                                   ; ...but relative extruder moves

; Network
M550 P"P3steel"                                       ; Set machine name
M551 P"iasdf"                                         ; Set password
M552 S1                                               ; Enable network
M586 P0 S1                                            ; Enable HTTP
M586 P1 S0                                            ; Disable FTP
M586 P2 S0                                            ; Disable Telnet

; Drives
M584 X0 Y8 E1 Z2:4	V3 W7 U9		                  ; two Z motors connected to driver outputs Z and E1
M569 P0 S1                                            ; Drive 0 goes forwards
M569 P1 S0                                            ; Drive 1 goes backwards 
M569 P2 S1                                            ; Drive 2 goes forwards
M569 P3 S1                                            ; Drive 3 goes forwards
M569 P4 S1                                            ; Drive 4 goes forwards
M569 P8 S0                                            ; Drive 8 goes backwards  
M569 P9 S0                                            ; Drive 9 goes backwards    
M569 P7 S1                                            ; Drive 7 goes forwards   

M350 X16 Y16 Z16:16 V16 U16 W16 I1                                             ; Configure microstepping without interpolation
M350 E16 I1                                                                    ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00:400.00 E409.0 U400 V162 W26                          ; Set steps per mm
M566 X300.00 Y300.00 Z36.00:36.00 E360.00 U200 V3600 W300                      ; Set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z1200.00:1200.00 E7200.00 U1000 V7000 W9000           ; Set maximum speeds (mm/min)
M201 X900.00 Y900.00 Z120.00:120.00 E15000.00 U500 V900 W900                   ; Set accelerations (mm/s^2)
M906 X1500.00 Y1500.00 Z800.00:800.00 E1250.00 U800 V1000 W750 I30           ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 				                                                       ; Set idle timeout


;Duel z compensation
M671 X-55:296 Y0:0 S5                                 ; leadscrews at left (connected to Z) and right


; Axis Limits
M208 X-8 Y-5 Z0 U0 V-1000 W0 S1                                    ; Set axis minima
M208 X237 Y215 Z200 U75 V1000 W78 S0                               ; Set axis maxima

; Stall detection
M915 X Y U V W S20 R1 F1

; Endstops
M574 X1 Y1 S3                                         ; Set endstops controlled by motor load detection
M574 U2 W1 S3	
M574 Z1 S2                                            ; Set endstops controlled by probe
M574 V1 P"e0stop" S1


;Filament sensor
;M591 D0 P1 C"ystop"

;led setup
M950 P2 C"e1heat" Q500
M42 P2 I1 S1				                          ; set lighting on full bright


; Z-Probe
M950 S0 C"duex.pwm1"                                ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F240 T9000                   ; Set Z probe type to bltouch and the dive height + speeds
G31 P500 X-14.65 Y19,29 Z3                            ; Set Z probe trigger value, offset and trigger height
M557 X20:222 Y15:215 S30                              ; Define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 A"Bed" ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                                 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 A109.9 C411.9 D9.6 V11.7 B0 S1.00             ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                               ; map heated bed to heater 0
M143 H0 S120                                          ; set temperature limit for heater 0 to 120C
M308 S1 P"spi.cs1" Y"rtd-max31865" A"Hotend"          ; create sensor number 1 as a PT100 sensor in the first position on the Duet 2 daughter board connector
M950 H1 C"e0heat" T1                                  ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 A354.8 C196.4 D4.3 V12 B0 S1.00               ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S400 
M308 S2 Y"drivers" A"Drivers"                         ; Set temperature limit for heater 1 to 400C

; Fans
M950 F0 C"fan0" Q500                                  ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 C"Part Cooler"                         ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                                  ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 C"Heatsink Cooler"                  ; set fan 1 value. Thermostatic control is turned on

;Tools
M563 P0 D0 H1                                      ; Define tool 0
G10 P0 X0 Y0 Z0                                    ; Set tool 0 axis offsets
G10 P0 R0 S0                                       ; Set initial tool 0 active and standby temperatures to 0C

M563 P1 D0 H1                                      ; Define tool 1
G10 P1 X0 Y0 Z0	                                   ; Set tool 1 axis offsets
G10 P1 R0 S0                                       ; Set initial tool 1 active and standby temperatures to 0C

M563 P2 D0 H1                                      ; Define tool 2
G10 P2 X0 Y0 Z0                                    ; Set tool 2 axis offsets
G10 P2 R0 S0 					                   ; Set initial tool 2 active and standby temperatures to 0C

M563 P3 D0 H1                                      ; Define tool 3
G10 P3 X0 Y0 Z0                                    ; Set tool 3 axis offsets
G10 P3 R0 S0 					                   ; Set initial tool 3 active and standby temperatures to 0C

M563 P4 D0 H1                                      ; Define tool 4
G10 P4 X0 Y0 Z0                                    ; Set tool 4 axis offsets
G10 P4 R0 S0 					                   ; Set initial tool 4 active and standby temperatures to 0C


;retraction setup
M207 P0 S0.8 F3000 Z0.2								  ;basic Retraction setup

; Automatic saving after power loss is not enabled
M911 S10.7 R22 P"M913 X0 Y0 G91 M83 G1 Z3 E-1 F1000"

; Custom settings are not configured

T-1 P0

Tpre0.g

; called before tool 0 is selected

G90				     ; absolute moves
M913 U100 V100 W100
G1 U1 F2000           		     ; move selector to T0 position
G1 W4 F10000	      		; move idler to T0 position
M400		     	                 ; wait for moves to stop
M98 P"tpremaster.g"
;M591 D0 P2 C"xstop" S1                ; activate filament sensor

TpreMaster.g

M574 V1 S1 P"e0stop" ; set V axis max endstop to switched low
G91 ; relative moves
G1 V40 H1 F3000 ; feed filament to filament sensor
G92 V0 ; force V to 0mm
G1 V10 F3000 ; feed a bit more to reliably switch sensor and reach tube
G92 V0 ; force V to 0mm
M400 ; wait for moves to finish
	
if !sensors.endstops[4].triggered  ; checks if V axis endstop is triggered
  M291 P"Filament loading failed" S3
  abort


M574 V1 S3			; set V axis max endstop to sensorless
M913 V50               		; reduce motor current to 30% to prevent grinding
M915 V S20 F0                    ; set stall guard parameters
M400				; wait for moves to finish
G1 H1 V900 F5000	        ; fast feed filament into extruder
G92 V0				; force V to 0mm
G90				; absolute moves

Tpost0.g

; called after tool 0 has been selected

M913 U100 V100 W100		; 100% current on UVW
G1 W4				; move W to engage filament
M116 P0				; wait for nozzle heat up
M98 P"tpostmaster.g"		; run postmaster.g

TpostMaster.g

G1 E10 V10 F300			; feed filament into extruder with both V and E axis
;activate laser pew pew pew
G90				; absolute moves
G1 W78 F10000			; move W to safe position
G91				; relative moves
G1 E10 F5000 		        ; drive extruder for 90mm 
;G1 E10 F300			; slowly load the hotend
G90				; absolute moves

@chrishamm

made the changes you suggested, and it is getting it to a working state. there still seem to be a noticeable delay that changes from probe to probe. but none of them are long enough to error out the BLtouch.

so its working, but not sure if it behaving as intended. but maybe as good as it gonna get on a pretty unusual config.

@phaedrux

Yup

M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 SBC FIRMWARE_VERSION: 3.3RC2 ELECTRONICS: Duet 2 1.02 or later + SBC + DueX5 FIRMWARE_DATE: 2021-05-11 14:55:15

@dc42
tried updating, and after that i also tried reinstalling duetpi-lite.
both have not changed my problem

@dc42

so i have tried two things today.

first i tried running with the probe set as P8 and this seems to work just fin.
video

then i tried to switch out my current BlTouch 3.1 to an older 2.2 running as a P9.
this BlTouch does not have the same issue as the 3.1 but instead does a double bounce on retraction.
video

with both it does not seem to error out the Bltouch, but the 3.1 still seems to experience the hang up when deploying and retracting.

@dc42 Will try that tomorrow

@dc42 Tried it, it did not change anything.

but i think the problem lies in deployment and retraction of the probe

because if io do a repeatability test with the following code it does not hang anywhere. as it does not deploy and retract the probe between touch off.

M291 P"Probe will be tested 10 times and return mean and standard deviation. Ok or Cancel?" R"WARNING" S3 ; User must click OK or cancel.
M401
G28 Z
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P0 X100 Y101 Z-9999
G30 P9 X100 Y101 Z-9999 S-1
M402

is there maybe a way to get it to not retract and deploy the probe between each point in a G29, as a quick fix solution?

@dc42

any instructions on doing number 1. as i at the moment i dont have a resistor handy?

edit:
is it this

@phaedrux
so tried removing my PT100 sensor and paneldue from my config to see if that was making somekind of problem.
it did not help.

busy grasping at straws here

@nmsmith89
interresting, i was thinking it was something more to do with it being duet 2 and sbc

@phaedrux
my dive hight and speed was normally what you sugested but changed it trying to diagnose the problem.

but i have changed it back now to test

also changed the G31

; Z-Probe
M950 S0 C"duex.pwm1"                                  ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T9000                   ; Set Z probe type to bltouch and the dive height + speeds
G31 P25 X-14.65 Y19.29 Z3.24                         ; Set Z probe trigger value, offset and trigger height
M557 X20:222 Y15:215 S30                              ; Define mesh grid

it homed z fine, ran G29 2 times and both times it failed within the first 5 probes

Edit: just had it happen on a z-axis home

M122 from right after

M122
=== Diagnostics ===
RepRapFirmware for Duet 2 SBC version 3.3RC1 (2021-05-01 09:58:40) running on Duet 2 1.02 or later + SBC + DueX5 (SBC mode)
Board ID: 08DGM-9T6BU-FG3S8-6J1DJ-3SN6M-1SLBG
Used output buffers: 1 of 24 (23 max)
=== RTOS ===
Static ram: 17420
Dynamic ram: 63144 of which 0 recycled
Never used RAM 30996, free system stack 126 words
Tasks: SBC(ready,13.4%,291) HEAT(delaying,0.1%,331) Move(notifyWait,0.2%,305) DUEX(notifyWait,0.0%,24) MAIN(running,86.3%,479) IDLE(ready,0.0%,30), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 02:04:30 ago, cause: power up
Last software reset at 2021-05-09 07:30, reason: User, none spinning, available RAM 30788, slot 1
Software reset code 0x0012 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
Step timer max interval 0
MCU temperature: min 31.8, current 38.1, max 38.6
Supply voltage: min 12.0, current 12.1, max 12.1, under voltage events: 0, over voltage events: 0, power good: yes
Heap OK, handles allocated/used 99/1, heap memory allocated/used/recyclable 2048/24/12, gc cycles 0
Driver 0: position 9600, standstill, SG min/max 0/301
Driver 1: position 8800, standstill, SG min/max not available
Driver 2: position 3296, standstill, SG min/max 65/299
Driver 3: position 0, standstill, SG min/max not available
Driver 4: position 0, standstill, SG min/max 0/293
Driver 5: position 0, standstill, SG min/max not available
Driver 6: position 0, standstill, SG min/max not available
Driver 7: position 0, standstill, SG min/max not available
Driver 8: position 0, standstill, SG min/max 0/634
Driver 9: position 0, standstill, SG min/max not available
Driver 10: position 0
Driver 11: position 0
Date/time: 2021-05-09 09:40:37
Cache data hit count 4294967295
Slowest loop: 784.16ms; fastest: 0.09ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Move ===
DMs created 83, maxWait 7403072ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 6, completed moves 6, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP* is doing "M122" in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== Filament sensors ===
Extruder 0 sensor: no filament
=== DueX ===
Read count 1, 0.01 reads/min
=== SBC interface ===
State: 4, failed transfers: 0
Last transfer: 4ms ago
RX/TX seq numbers: 61060/61060
SPI underruns 0, overruns 0
Number of disconnects: 0, IAP RAM available 0x0d08c
Buffer RX/TX: 0/0-0
=== Duet Control Server ===
Duet Control Server v3.3-rc1
Daemon:
Finishing macro daemon.g, started by system
> Next stack level
Code buffer space: 4096
Configured SPI speed: 8000000 Hz
Full transfers per second: 34.10
Codes per second: 0.12
Maximum length of RX/TX data transfers: 3632/700