Only happened to me once, came to car in garage and rear nearside was open, I was flaggergasted. Next time I parked I found out why, I reverse into the garage, take the driver window down to guage the 20 cm space I need on my side of the door jamb to be central parked. While holding the driver switch I accidentally touch another switch with my little finger without realising concentrating on reversing! Now I pay more attention.