My RF window was also non functioning a few months ago. I washed the car, paying attention to cleaning the rubber seal at the window and it works fine now. Perhaps the seal was holding it in place??? It is sure worth checking as the "fix" is easy and free.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles