My 02 adventure does the same thing, haven't been able to solve the problem yet.
It's working at the moment but it could quit tomorrow. I have raised the dash cover and let it down hard and sometimes that works.
I believe like one poster said, it is in the wiring to the door. When my window quits, the mirror and heater also quits.
If you find the solution please let me know. If I knew how to trace the wiring from the door to it's supply, that might help. But when I look at the wiring diagram I'm lost
Ron
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2002 32' Adventurer 8.1 Workhorse no toad
Our 2 Girls,Sweetie Pie & Shadow
Florida