I'm using VW Saharan vr6 2.8, auto transmission. It was good MPV, but recently it give me headaches. Its auto transmission wouldn't work accordingly. When I drive quiet awhile, suddenly the gear drops down and wouldn't go back to top gear. I noticed than when there is a slow traffic in front, and there is heat after driving, the problem occurs. I have to stop the MPV a while, for half an hour, than it will be OK. Please give information or advise on this whoever has experience on it. Tq.