Thanks Gareth. I have had a performance cars before, it was Bentley V8s with the same problem, dealer has replaced both immediately given the same fact.
Funny enough, I have spoken to the mechanic and he has said that it was a mechanical fault inside the absorber and there was no leak???. Since when we have oil or any other liquid inside absorber, it was there back to 90's now it is filled with a gas. After all my suggestions , he said that Audi replaces only faulty parts, that's it. Will see on Monday.