Since I updated my s9 to android 10 back in february it has audio fading, it comes and goes, listening to music, watching movies, etc.. is like the volume drops a lot for a few seconds and then goes up again.
It did not have this problem before that update and hasn't been solved by any of the updates after. I also factory resetted it and the problem still happens.
Hope you can help me, i really love this phone. No other complains.