If its possible to position the cable so you have a good connection and for that to not move can you test to see if the problem re-occurs. I am trying to discover if its a physical problem with the port or a different issue. For example, is there anything other than moving the cable that triggers the disconnection? Is the Phy IC (the KSZ8081RNACA identified above) getting hot? Or posisbly hot when the disconnection happens
I can reproduce that any time. When just switched on, while printing, after a print is finished. I fixed the cable with a cable tie to the frame of the printer, then it stays stable for some time. But as soon as the printer is moved or due to vibration while printing it can happen, that the position of the cable slightly changes and the connection is lost. When I reposition the cable, I can get it fixed again. But to be honest: A cable tie is not a solution for a 260 Euros board....
I left the printer on for an hour now, the chip is not getting hot, it is not even getting warm.
from your config.g you use 2,3,4 drivers for your Z axis. Which one was not moving? Is that permanent or intermittent now?
#3, permanent. I tried it several times today because I dismounted and remounted the board for the pictures in this thread. #3 is dead since I wanted to start a print yesterday. I switched the printer off on Monday and wanted to start a new print yesterday, and as I said above, while homing Z axis I saw, that one axis did not work. Luckily I was in front of the printer to interrupt otherwise it would have killed my bed. I never had that issue before. It just adds to the two other issues now...
The motor is not powered. I can turn this axis easily by hand, while the other two are blocked.
The Ethernet circuitry is quite a way from the stepper driver circuitry and relatively contained so I am not sure that the two issues are related to the same problem.
Just want to mention the filament switch again. The mechanism is foolproof. The microswitch can only trigger, when there is no filament in. Nevertheless I sometimes get "filament out" messages in the middle of a print, although filament is fine. Because I never found a reason for that, when it happened again I tested, if I was able to resume the print without doing anything but clicking on resume. I did not change anything at the filament or the switch. And, miracle, it just continued printing.
Something is definitely wrong with this board and it is getting worse. So I finally filled out the warranty form today.
BTW: I'm running a Duet2 with. Duex5 expansion now for some time on another printer. Never had any issue with that board and it printed quite a lot The printer is also nearly an identical build but a little smaller. Using the same motors, switches, etc.
Best regards,