Hi,
Just joined the club and this is the first post I have seen. Have a very similar problem especially when the car is cold, feels just like a someone behind has given a good nudge. Have had the stalling problem just once. Car is A5 Quatrro 3.0 TD with 7 speed S-Tronic gearbox, with high 121k miles.
Also interested in others experiences, and any recommendations for Auto gearbox specialists in Sussex/Surrey area as I'd like to get this checked.