Locking and unlocking

[Clueless88]

Sorry if this has already been covered but search isn't working! 

My car is a key lock only but recently every time I get out to lock it, it unlocks almost immediately. I have to open and close the door about 10 times before it'll stay locked. Has anyone else experienced this or does anyone have advice? 

Thanks! 

[jeff-d]

It might be that one of the other locks is stuck or sticky.

If (say) the passenger door fails to lock then shortly after the central locking will think that that door has been opened and open the rest of the doors.

 

(Many years ago mine did this when the passenger side froze during a particularly cold winter)