I was running a cut and my Z didn’t raise. There were no physical issues I could find. I held the sled off my piece and paused with my phone but before the pause went through the left motor also stopped moving and the sled veered off into places it should not go.
After that I could not get the Z motor to move at all until I removed USB and power from the Arduino. Now everything works as before but I’m wondering what caused the two motors to stop functioning so closely together.