For a possibility with the window check the cable running between the door and the body inside the big rubber hose. In both of my MK3 GTi and VR6 one or two of the cables were fractured causing faults. The two cables are the heavier gauge ones, a brown one and yellow/red one I think, and look to me like they were made a bit too short at the factory putting excess stress on them. This fractured cable fault caused all sorts of weird things to happen in my GTi, like the driver’s window up button shutting the sunroof instead of shutting the window. On the VR6 the driver’s window simply lowered on