That happens to my front windows, randomly one or the other or both every couple of months or so, sometimes more... seems the code B148754 goes along with this, the code comes up for the Driver's AND Passenger's Door modules....
Its annoying to fix but my previous GTI had the exact same problem, kind of used to it... doesn't it happen to everyone? I was under the impression we just had to live with it unless it was resetting every time...
Also btw it could be the switch itself... but it also could be the wiring...