I had one of these POS Escorts back in the day. Mine did the same thing. Something probably happened to the track it's on. Probably debris or damaged somehow? My dad disassembled the track assembly and put it back together and it worked fine after that. It was a PITA though... Another thing that worked temporarily was taking a screw driver and separating the track a bit where it's getting stuck.Hitting it with a hammer didnt help