My bi-annual "please add AirPlay 2 support to the enhanced player" post

[BigB01]

I believe this is your same issue and we are seeing some progress here:

AirPlay issues with the new audio engine on Apple TV

So in an effort to reproduce this I realised my LG SP11RA Soundbar supports AirPlay. Sure enough I was able to reproduce the audio drop out issue today after a minute or two. What I noticed is the audio dropped out for a split second a few times before going away completely. I have gathered my own logs and will update our internal issue with my findings later tonight.