So we noticed the arm was a little loose, so we tightened both of the set screws to the woodruff key. But I think the main problem was the placement of the sensor. The carriage was getting very close. When we checked the space it was only about .005". We loosened it to .030" and haven't gotten an error since. Granted it has only been a couple of days with very light usage. This next week I should get more work out of it so that will be the real test.