2014 A3 S-Line stereo issues

[Jamieking86]

Hi all, probably slightly different than your usual threads but i have a stereo issue that is quite frustrating.

I always listen to my ipod in the car which obviously connects via bluetooth, but with when any bass starts to play on the track, for example heavy drumming, the music goes quieter as if the volumes just been turned down about 7 notches, when the drumming stops the music goes louder again as if you've just turned the volume back up. It's quite frustrating because this happens with every track and hearing the music constantly go up and down can be quite annoying. Anybody any suggestions what the solution could be? I don't think it's my ipod because i connect it to my van as well, and the sound in my van is fine. I've tried playing with the sound settings in the Audi but nothing seems to help. TIA