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Mine (2009) was cutting in and out then finally quit. Turned out to be a bad wiring harness. Expensive and a PITA to get fixed. Pretty much requires a dealer as Audi Technical won't talk to an indy shop. Best of luck.
I took to audi dealership they couldn't tell me what was wrong with it they wanted to keep it and run diagnostics a d charge me 2k and more just to check it out. Thanks for the input.