If you think, your Audi has a serious defect that affects the safety of the vehicle, report it to the Audi Dealer immediately. If you’re not happy with how the Audi Dealer is dealing with your report, in the UK you should contact the Driver and Vehicle Standards Agency (DVSA).
But before that, you can describe the fault of your Audi in our forum. Maybe some other Audi owner will learn that he has the same problem. Multiple occurrences of identical defects mean a better chance of success in a complaint filed with the DVSA. Our website is visited by Audi owners from all over the world.