I had the rear window down for a while yesterday to cool off the truck. When it came time to close everything all it did was go up maybe 2" and then it immediately reversed and went down again. Did that with the dash switch and when using the key in the liftgate. Tried various different ways with no success. I finally opened the liftgate fully and then the window closed completely with the gate in a horizontal position. Anybody know if there is a safety override like auto garage door closers have, to stop if an obstruction is detected, or is it time to schedule warranty work at the dealer?