It's a 2004 Arosa S - great little car, but a locking problem. I first noticed when using the remote fob that sometimes it would lock/unlock, then sometimes not. New battery in the fob, of course, but no difference. I then started using the key instead of the fob which was fine for a while, but although it always opens, most if the time it will only lock the driver door, not the boot or passenger door. Summer's coming and I need to leave stuff in the car overnight - where should I start looking? Any advice gratefully accepted.