A door window may move slowly or stop in mid travel due to a failing power window motor. The affected window may start working again after the motor cools off. Replacing the faulty window motor will commonly correct this concern.Google+
Car Problem Reports
GMC S15 Jimmy Power Window Motors May Fail From Overheating
GMC S15 Jimmy Problem
Visitor, 1991 GMC S15 Jimmy, 132,000 mi
Window stops either half way up or half way down. I have to wait several minutes before I can try to operate it again. Sometimes if I 'help it' it will work.