> I had this problem about a year ago.  Symptoms:  over bumps, like railroad
> tracks, or a dirt road, door came ajar--not enough to slide open, but
> enough to concern me.  Solution:  replace the lock at the rear of the
> door.  I ordered the part from Camelback VW in Phoenix (mailorder).  The
> trick to replacing is that the screws are difficult to get to.  I happened
> to have a socked type screw head that fit on my ratchet wrench.  Without
> this, it would have been tough.