A couple of weeks ago my rear o/s door started to randomly not unlock when using the central locking remote. I was having to reach inside and open it. I was going to get it looked at when it went in for it's MOT last week but it randomly decided to start working again so I left it. I started noticing in the last few days that when I lock the car I can hear the locking mechanism working on that door but it is rapidly clunking like it is struggling to lock......which today I discovered is what seems to be happening. Whilst driving to the supermarket I could hear the lock constantly trying to engage and I'm guessing it was trying to lock itself automatically, as it does when you pull away after started up. When I got home I locked the car and tried the back door and sure enough it was unlocked.
Any ideas on this? Faulty lock perhaps?