This will most likely sound pretty obvious but it may help, sounds like "something" is expanding in the heat and causing a wire or connection to no longer.....Connect.
My first option would be to get a multimeter out and measure the circuit both warm and cold and see if there is a difference? while doing this maybe dont drive it in between measurements so as not to move connections around either. If its consistent power going through both hot an cold might be the window motor.
Im no Wizz but this should be a start for you.


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