My 2002 M5 with comfort seats and the adjustable top end, has an annoying habit. The driver seats back rest seems to have developed some lateral play. Upon hard cornering I can feel a little (and very, very annoying) nudge in the back. When I try to move the seat by hand from side to side, it does seem to have more play than the passenger seat. The car only has 16'000km. I wonder if any one else has experienced this. Now I know that the dealership will solve the problem under warranty but I'll have to wait for the next service, which is a will away or I have to leave the car for a day, which bugs me profoundly. Is it easy to solve or do you need to be an engineer.