Central locking

I have the same problem. I even replaced my alarm system. The alaarm guy said there is a microswitch (perhaps he means the driver side acctuator) in the driver's side door that can be adjusted, but may need to be replaced. He has messed with it and it seems to be working, in the meantime, no supplier here (Trinidad) seems to know what I am talking about. The alarm guy said it might be attached to a latch assembly.I only found your post as I was googling the problem and trying to see if anyone else had the same problem.
At first my wife thought we had a mouse or squirrel in the hatch door! It even ran the battery down once when we went away for the weekend.

So my doors worked for a week after the alarm guy cleaned the microswitch relay attached to the driver's door actuator (master actuator?). It rained really heavily on Sunday and the boot started rattling again. Saw somewhere that it could be a short in the boot actuator or harness that could screw with all the doors. Will try to clean boot actuator before getting a new master actuator for driver's side door.

OK. So I have a new problem. The two front door handles are playing up. The locking tab inside the driver's door seems to have broken. So no central unlocking from inside.

The passenger door inside lever broke off in the ******-in-law's hand and now the door won't open at all. From inside or out, but I can hear the door unlock from outside when I push the remote unlock, the outer lever seems to have magically disconnected. The relay is not on the actuator, apparently it is on the latch assembly that physically closes on the hoop on the body of the car. So I may have to get a latch assembly. But first the bloody inner handles. Both left and right! Sigh. Ah. Also. Because the passenger door would not open, the wife was driving and I climbed out the window holding onto the roof rack. It fell away in my hands. All the plastic bases and the dowels were completely dry rotten. Thank goodness they never took load because the load would have been everywhere but on top the blighted Matrix. The madam was less than well pleased.

Its her car.