Does anyone have experience troubleshooting autoreversing track? Not matter what I do, I can't get the train to reverse, I simplified my setup down to only 3 pieces of track to eliminate variables, but it seems like the track piece with the power cord is not flipping the current when the trolly gets to the end, so it just stops dead. Only about 1 year old, and not heavily used. Trolly works fine in either direction.