Just went out and started my car and had light snow on the windshield so I did a quick wipe. About 5 minutes later did the same thing on the highway and all of the sudden the wipers stopped in the middle of the passage and stayed there. Could still hear the motor working and it stayed on the intermittent cycle even when I shut it off. Thinking gears maybe, any ideas?? Could manually push the wipers back to starting point easily