Don, either you have a faulty park sensor or much more likely the vision gantry Y axis is not reaching the sensor. Possible issues, one of the two VY drivers cards is failing; one of the VY forcer motors (air bearings) is failing; to much air leaking from the forcer air tubing; misalignment of the forcers to platen (long metal bars the forcers ride on). Possibly, but very unlikely, there could be issues with the CPU motion card, interface card or even I/O system.
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