As you know, the door glass on the Challengers drops about a 1/2" when you open the door, and goes back up when the door closes. I just now discovered that when sitting parked, shut off and unattended, the glass is doing its up and down thing all by itself, about every 10 seconds. I tried cycling through the power door lock and window switches a few times, thinking a switch was stuck, but no help there. If I unlock the car and the headlights come on and stay on, and the window doesn't cycle, but when the headlights shut off, the window starts its up and down cycle by itself. Any ideas as to what the problem is?