CNC XPro v3 malfunction

Having a bit of a problem with my v3. It had been working fine, then suddenly 'locked up' X and Z axis will not move. Motors are holding, and resist being turned by hand. Any attempt to jog the position shows no movement of the motor, and no increase/decrease in position in the software. BUT, if I try to move the Y axis, it will unlock all the motors, show a position change in the software, then relock all the motors when the move finishes, but the Y-axis motor doesn't actually move.

I've...

CNC XPro v3 malfunction