[Dave928]

if the window regulator is starting to bind, the window controller could see that as a pinch condition and reverse the motor.

try this: roll the window up and grab the top of the glass and pull up at the same time. you're lightening the load on the motor. you might have to try a few times with increasing amounts of pulling tension. if it goes all the way up then you know what it is.

probably need a new cable/regulator assy and window guides.