Relax, I got a new clutch because of the sound (apparently nobody knew what it was all about) and the sound came back again, not very loud but it is still there and I suppose it gets worse when the cold season starts because it was really bad during cold weather.

New clutch? GREAT. Usually the gearbox has to be removed to exchange the clutch, making it a pretty expensive thing to do. If Porsche does it on warranty, why should I complain?!