tis a standard safety feature thats on the car, but it also means the door shut/open switch on your drivers door isnt working.....
the car is set so that if its unlocked by the remote.... and no body actually enters the car/opens door it will lock its self after 30 seconds, normally once the drivers door is opened this cancels it, but if your door switch in playing up (like mine do all the time) it dosnt register that youve opend the door so the car will then lock its self. sooooo
either put key in ignition and turn it on with in 30 secs (this will cancel it), or get your door switch looked at... (you can tell when its playing up as the red light on the dorr dosnt light up when its opened, and your buzzer for leaving your lights on wont work etc....
common mk4 prob im afraid.......
remove your door panel and spray locking mechanism (as switch built in) with electrical contact cleaner.. this works for a month or so for me... we i can be @rsed
