im also experiencing same issue mines is an audi A1 sline year 2017, all fm channels seem to be working just fine but my dab channels randomly stopped working about week and a half ago, i booked in with my audi dealership for a diagnostics check which cost £150 plus vat and they have came back saying the dab antenna is on the back windscreen left pannel disguised as 2 small copper wires and as i have my window tinted this and general wear and tear over the years has caused this problem i would need to replace my back windsceen and was told roughly it would cost between 700-800 pounds if i wanted them to deal with it, i explained to them my car came with the back windscreen tinted and iv had the car for well over a year now and never had this problem until lastweek not to mention loads of other audi owners are experiencing the same problem all round about the same time so dont think this is what caused the issue but audi was certain in what they were saying, Then after reading posts on different forums etc its clearly nothing to do with having the back windscreen tinted or even general wear and tear as it is a widespread problem with audi owners at the moment so doing some further research on my own i found out the problem lies with dab changing to dab+ so audi was clearly wrong and just looking to gain £700-800 out of me ontop of the £150 +vat for a diagnostics check. Thankfully i refused for them to carry out replacing the back windscreen and saved myself being out of pocket as this would not have solves the problem regardless
