audio sound problems HELP!!!
 

HI everyone titan here i have a 05 a6 3.2 with like 54.000 miles on it. just about a week ago while driving the audio in the car started cutting out about every 30 sec for just a few seconds. and as i watch the MMI screen i see the muting symbol for a split second then it resumes normal playback when this happens it affects the radio, cd and f i happen to be changing the temp or adjusting the airflow when the 30 seconds hits it automatically goes back to the previous screen even if im in the middle of adjusting something. Now i tried to look the problem up on the internet even asked the dealer what the problems might be but since (in there opinion) there might be a number of things wrong the need to run a diagnostic thats gonna cost $150 just to tell me whats wrong (which is a general load of Horse%&*^) anyway i frustrated and need any advice you guys thanks.