Hi all,I had encountered a locking problem on the driver-side door. I could lock it when i leave the car, but when i unlocked the car, the driver-side door doesn't get unlocked. while driving the car, when the car reaches 20km/h, the central-locking kicks in, but doesn't lock the driver-side door. when i used the key to unlock the door, i got the turn the key a little faster to get it to unlock.Has anyone encountered similar problem? any advice would be very much appreciated.