I have a Sabre 1500 with an A2100 control. BDS4 Servo Drives. The machine powers up just fine and I am able to align the machine just fine. I can move the X and Z axes fine. The Y axis will move out approximately 15 inches and the machine shuts down with a servo drive enable signal lost. I can clear the alarm, power the machine back up and move the axis back to the home switch. This seems to happen in about the same position every time. Any ideas on what would be causing this??