Here's one for the Auto Electricians,

I have a 2007 Audi TT TFSI fitted with a Audi Concert Radio my problem is the radio has a life of its own when I start the car the radio lights up as normal showing which radio station it is tuned to etc but this is where it gets rather strange because it either starts up as normal OR no sound at all THEN comes on for 2 seconds and goes off again OR the sound comes on at no particular time and stops on for the full journey and when the car is re-started the same options again, it may come on or it may not.

This seems to be more prominent when the weather is cold and although it still does it in summer when it is warm it doesn't do it as much and comes on as it should.
Any Ideas whats wrong with it and what I can do to put it right???