A minor problem we had on our trip to Arizona was that the sliding door lock doesn't hold "tight" all the time.  After you start driving, it kind of "slips" a little - stays shut, but not tightly.  It never opened up, but wasn't tightly closed, even though it was locked.  Any idea how to fix this?

Thanks,

Sharon & Bob Mendonca
88 Vanagon GL
88 Westy