I don't have that problem but based on your description, my money is on the linkage to the external door handle being disconnected or broken, and sitting in the path of the window coming down, in such a way as to cause the linkage to activate the latch opening as the window presses on it. Pull the door panel (with the window up) and look for loose/dangling parts. You may have to buy replacement linkage due to bending/breaking at this point, but you might get lucky and just be able to put it back together.