Have you check to conecting at the spindle motor....the wire are just crimped ...but they don't twist wires before crimping which can cause an intermitten type of promblem...If you have a bad conecting any where in the Spindle circut you could trip a fualt...I spent long time tracking down a short on my Z axis (see photo)...When I check the wires by pulling on them they felt good as in a solid conecting....But after the stepper motor stop working I found the wire discolored from heat at the crimp...That is what makes tracking an intermittent issue a pain as it could be anywhere...I don't know if this is your issue... but it will not hurt to check...After I pulled the motor I put a meter on it and there is no short in the motor it is still good...just a bad crimp job |