2016 Ford F-150 lighting problems

Fire and lots of smoke inside my truck when I used my remote start inside my garage ...dropped back seat, pulled carpet back and witness and recorded a burnt wire hanging down across rear window that kept burning and never stopped/popped a fuse or relay until I shut down the remote start. Ford dealership said it was the rear defroster that automatically turns on when using remote start ...replaced entire back window and wire harness split cost with ford not under warranty '.

Purchased used 2016 f-150 in oct 2017. Shortly after purchase tailgate would randomly open while vehicle was in motion. Power tailgate would also open when key fob was used to lock vehicle. Tail lights would also illuminate brightly as if brakes were applied when they were not when vehicle was in motion. Other times tail lights would flicker on and off when vehicle was in motion. When computer was scanned no trouble codes were found.