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This may be an overfeed problem.
First, check that the paper guides are set correctly.
Remove the paper from the tray and make sure the stop lines up with the mark on the tray.
Try using paper from a different batch or supplier in case it is sticking.
Another possibility is that the pick-up feeder is sticking on and causing the roller to stay engaged, feeding in too many sheets - in this case, the machine will require a repair.