Central locking weirdness

[Mighty306]

I had this problem but it went away on its own. Am sure it will reoccur at some point tho. If I slammed all the doors really hard (inc the boot) it would then lock. When the doors aren't properly shut the central locking doesn't work - just pops back up. I think (may be wrong on this) that there's a switch to detect when the door mechanism is fully engaged. Could be this is sticking?

EDIT: Sorry, just read your post properly n realised it's not the same problem I had so above suggestion not likely to be any help!!!!