I own a 2016 A6 C7 and a few weeks ago the DAB stopped working on all the local as well as national channels. I was about to book it into my local dealership but decided to google the question to see if there were any forums highlighting the same issue. The rest as they say is history. I’m glad I’m not alone as it was unexpected and my DAB has worked perfectly until now. Too much of a coincidence for it to be an isolated issue. I’m glad I didn’t waste £150 pounds for them to tell me something I already know. Let’s hope Audi do have a fix and soon