Rear Door Drives side window glass not closing 100%
At random times and sometimes after opening/closing (with drive seat master control) the drivers side rear door glass closing backs off a tad leaving the window 99% close, detected by the sound of air leaking when driving. A second or third application of closing the window from driver's seat controls eventually closes it 100%, but the first of second attempt to close it (after detecting wind noise 1% opened) doesn't always seem to close it 100% either. It seems to bounce back 1% with attempts to close it. I then hear the wind noise when in motion and open/close a couple of times to get 100% to stay close. It seems to "bounce" back open on a full close attempt randomly. I also suspect on start up it may be going to 99% as I have to do this switch toggle close dance sometime after starting out on a drive w/o ever having opened the window in the first place. Only on drivers rear door glass so far, other 3 door windows all act fine.
Anyone having this odd behavior on any window switch / motors?
Will have dealer look at it on final under maintenance service coming up, but given the random nature of it I am not confident they can reproduce / diagnose it (unless it is a common fault in the door switch / window motor).