My in-laws have a 2006 Grand Caravan, bought new, that they have had for a little over a year now. The driver side sliding door is not opening sometimes. It gets hung up, on the latch I believe, in the rear. They had it in to the dealer last week to have it repaired. A part was replaced and said to have fixed the problem. The problem came back the next day. Is it common problem with these vans?