Mk 2 motor not stopping

My cetus mk2 stopped recognizing the z axis height this morning. When I initalize the printer, it moves up the axis until it hits the top, then continues to try to move up, causing the motor to skip on the track. Since it’s during initialization, I can’t play with the settings on the computer to rectify the situation, so I’m not sure exactly what to do in this case. Has anybody had any experience with something like this?