I've got a 2006 A6 3.0 TDI Quattro with Tip

The radio just cut out and now it say please wait, its says the same thing on the NAV, CD and phone settings. Also the mode button on the steering wheel has stopped working.

Its the factory fitted system, no mods.

I've tried turning everything off, but it starts up again with same problem

Anyone got any idea what the problem might be

Cheers