I have almost exactly the same problem, I'd say the whole system works fine about 70% of the time. At other times it'll only lock the drivers door and nothing else. Sometimes the boot stays locked when everything else opens. I find that it's best to be gentle with the key when you're locking the car, i.e. put the key in, turn it to the left fairly slowly and hold it locked to the left for a couple of seconds before pulling it out. This seems to give the air system time to spring into action. Apart from that I can't be much more help - I've done nothing about trying to fix mine as it doesn't cause me much grief - car is rarely parked in public places, and if it is I make sure it's locked, albeit if it means doing the old fashioned walk around the car pushing the locks down!
