I'll try that on mine, but it is more likely that the window is binding. Right at the time that the window stops there is a thunk/clunk sound. It is not very loud, but only happens on that window and only when it is acting up.

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.