So maybe mystery solved? After weeks of observation I noticed that it happened when exiting the vehicle. The motion that did it was open door; swing feet to the left; facing towards the rear to exit and then *pushing down on the armrest with my _right_ hand to help myself stand.* The heel of my right hand grazed the window controls depressing them slightly. I also wonder if this action of putting weight on the armrest my sometimes slightly deform the switch assembly causing a roll down. On other cars you would have turned the car off and the windows are non-responsive. Perhaps the windows controls should be disabled when the car is off?