For about a year occasionally when I put my van in park it rolls away mostly within approx.5 seconds thankfully all the times this happened I was able to jump back in to hit the brake pedal. I told the dealer the problem about 1 month ago they looked into it and said they could not find any problem.Yesterday for the first time my van rolled out of park approx.3 minutes later and collided with my other vehicle.I was able to see this happen and the time it took to roll away in park do to the fact I have video surveillance.I am at this point putting a chock behind the tire til I can figure out what to do.