Hi folks, bumping this topic as I have a similar issue here with 2015 S3 8v, as witnessed by
@DJAlix on Monday during retrofit session:
DAB randomly disappears from waveband options having started car, and just as randomly reappears when next starting the next time.
Can only turn volume down.
Stored DAB channels are still displayed but cannot be selected.
DAB can be restored by resetting the MMI.
DJAlix couldn't find any errors logged but suggested that issue is likely with MMI module in glovebox . There is little ventilation around the module and it rapidly gets hot!
At the mo I'm pondering a firmware update, failing that buying a replacement MMI off ebay and getting DJAlix to sort the component protection. Car is out of warranty so no chance I'm paying upwards of 2k to Audi.
In the meantime I'm getting quite proficient at the 3 finger click .
BTW, thanks again DJAlix. I'll put a post in your review thread before long. Suffice to say for now that the speaker and sub upgrade is ace, as is the reversing camera. Yet to catch anything nefarious on the dashcams...touch wood!
Cheers
Jamie