Central Locking Problem

Firstly i have read the other posts regarding this problem which seem to point to the actuator if the drivers door is just not unlocking. My problem is slightly different in that when i press the unlock on the key fob the drivers door unlocks/relocks 3 times but remains locked. I guess the actuator is working but just not correctly so could still be the cause of the fault?

Thanks in advance for any help.

Jools.