This is new for my car an '86 560sl. Today as I started up the car to go to work, I tried to lower the window on the driver's side. It went down an inch and then stopped. It wouldn't work. The passenger side window worked ok. I looked for a bad fuse and there wasn't any. I had an extra power window switch and put that on and still nothing. An hour later went to the car to bring it to my local Mercedes rip off and the window works. I can't figure this one out..It's not like the motor got over heated.. Any ideas would be appreciated. I know this is going to happen again, probably at a place that is not good and leave me in distress with an open window. Thanks for any help.

Larry