I assume your other RW's worked ok on your current P/S- Clippy set up..So it sounds like one of two things, either your Gromett is rubbing against the Backplate,causing friction, and eventually stopping the machine,or, your motor is faulty.....I see you bought it used, so it will be hard to determine how many hours are on the Machine..What model is it..I wouldn't worry too much, changing a motor takes, 5mins................Will it run for unloaded for longer without stopping?...Lemme know the answer to this..P.