Remote central locking-drivers door sometimes not unlocking

[Therusterman]

As the title says, anyone have any pointers? At the moment I can usually unlock the door using the key fob and if this doesn't work use the key-but this sometimes takes a few cycles of locking and unlocking.

At the moment its an intermittent problem and doesn't appear to be affecting any of the other doors or the boot.

[itavaltalainen]

oem central locking or retrofit?
oem remote fob or retrofit?

first guess would be vacuum leak in door frame bulk head.

[Therusterman]

As far as I know its OEM central locking, has a Toad after market full closure alarm fitted.

When you say door frame bulkhead, do you mean where the rubber boot runs between the door frame and door?

[cjgti]

I have this very same problem. I was told it could be because of having a weak battery? Does that sound like something that might be causing it?