Nissan Terrano Central Locking

[alder53]

Hi I wonder if there is anyone on here that can help me? I have a central locking problem on my 2004 Terrano.It refuses to lock. The locks lock then immediately unlock. This is a intermittent problem. I've had it to the local Nissan garage and nothing came up on the diagnostics and all the wiring was checked and they could find nothing wrong so it was decided to change the drivers side door actuator. This seemed to cure the problem for about a week but it has now started again with the same problem. Any ideas?