Running a job today on my 1824 desktop, in the middle of a job the X axis started acting up. It would go forward about a half and inch and then backwards a half of an inch. The display said it was continuing to move even when it wasn't. Took off the deck, unplugged everything, tried to move the gantry with the same results. There is nothing physical stopping the movement.

Any and all suggestions appreciated. I'm going to put this machine up for sale and I don't want the new owner to have any problems.