Central locking problem..

having a problem with my central locking when i press my alarm to lock the car it locks no problem but if i go back out 10 mins later the door isnt locked and i can open it but the alarm will go off i also tried locking the car with the key and its the same thing bit hard to sleep knowing the car isn locked anybody have a issue like this before that might know..

possibly a dodgy acuater in drivers door lock mechanism . the little fella has to work harder to lock than unlock afaik

this happens with me too, but only when i run the turbo timer. lock it, walk away, come back and the door is open. haven't been able to figure it out.

yea i have a turbo timer on the car also i was thinkin it mite be down to that aswell but it has only started in the last 2 weeks say and the timer has bein on the car since i bought it so i dunno im confused the car locks and den unlocks a few mins later but still when u open the door the alarm goes off it dosent make sense to me