We have a Royal Sovereign RSC 1650C cold laminator that has been randomly shutting off while running and it has ruined a few prints by doing this. It only seems to do this when it is under a load, but this has never been a problem up to this point. If the speed setting is on, say, 4, it turns off completely in the middle of laminating. When the operator starts it again, the speed goes back to 1. Any idea what might be causing this?