Anyone had a problem of a tinny noise when the car changes from 5th gear to 4th (does it from 3rd to 4th too). Its like its down to one of the clutches but Audi have just told me its normal. I don't agree a noise like this from the gearbox is normal an an expensive car like this.

Any thoughts or advice?

Its a 09/2014 S5 convertible and I've only had it since August so want to get it resolved whilst I still have it under warranty.