I'm having serious issues with mine.
I can lock the driver's door off the barrel, but no sound like the other doors are trying to lock.
Also my key fob won't lock or unlock the car.
 
Faulty door lock module most likely, worth checking the wiring to the door though. It goes from the door module to a plug inside behind the kick panel.

Easiest thing is to scan the ccm (46) with vagcom or suitable vag scan tool.
 
Pull fuse 14 for 5 minutes then refit and retry, it could just be taking a wobbly

I know this is an old thread but pulling out fuse 14 seems to have stopped my door locking and the alarm activating while driving the last couple of days. I guess my door lock module is fecked.