I've had my disco up on the ramps at the back for a few days while I did a couple of repairs, last night the alarm randomly went off while I was in bed, I got up, went out and unlocked it and left it that way until today, i started it up today and took it for a run out (once I had finished the other jobs) it started fine as expected with the new battery it has. When I came back home and parked it up I got out and locked it with the remote, The horn blew once to alert me to a problem, the interior lights were on but all doors and tailgate were shut, I noticed that the passenger front door didn't lock either. Anyone have any clue?