If this just started you need to check the door springs and the drive gear. Both of these will cause this type problem. Check the springs for a broken one and you need to remove the cover from the motor unit and look at the drive gear. It is white nylon and is just in front of the motor.
Answers & Comments
If this just started you need to check the door springs and the drive gear. Both of these will cause this type problem. Check the springs for a broken one and you need to remove the cover from the motor unit and look at the drive gear. It is white nylon and is just in front of the motor.
The make and model number would really help.