My corexy printer yesterday had a catastrophic failure, because of a loose motor connection while homing or maybe auto bed leveling.
It looks like the board has recognized the problem:
Warning: motor phase B may be disconnected reported by driver(s) 4
(I'm not 100% sure if the warning occurred before or during the head crash.)
Now the question arises, why is this message only a warning and not an error. In my case it would have saved my printer if this warning had led to an emergency stop of the printer.
Or is that somehow configurable?
Btw: I know I can install safety endstops on my three Z axis to prevent head crashes like this.