My rear vent window on the drivers side sometimes doesn't move at all, (open or close) sometimes it will move a little either way but usually it doesn't open or close all the way before the motor seems to "die", for lack of a better term. If I wait a few minutes the motor will move a little bit more and then dies again. I disconnected the window and the motor seemed to work better and longer. Anyone have any ideas what could be wrong? Bad window motor maybe? The passenger side works fine...