Won't shut off by hitting the stop button
When I close the door it starts running and the only way to stop it is by opening the door.
"@jskarbek , John, If under warranty return for exchange/repair/refund. There may be a faulty switch /control board, regardless do to the fact that microwaves can be one of the most dangerous appliances to work on, best to have a good qualified technician have a look, diagnose and estimate repair.
I hope this helped you out, if so let me know by pressing the helpful button."