If you are sure the problem is not on the switch the it should definitely be the convinience module. W/A/S/C124s and W/V/C140s are famous for temperamental convinience modules, and the windows or the sunroof are always developing minds of their own. I would try to get a borrowed module from an independent tech and see if changing it cures your problem. If it does, then its time to buy a new one.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]