did you maybe switch the default from HDR to SDR?
that would increase banding.
I normally don't use the audio playback on the aTV much. so just a guess
Some of the early LG's have been known to suffer from banding. Does it happen on anything else? Darke scenes in 4K etc?
Search for it on AVS forum or AV forum and you will find the ways and means to check there.
Running the beta here and no banding on my OLED.
Had a shufty as I have never used this app. Seems to be OK, no banding. I don't subscribe so it was what I have in my library, if that makes any difference.Don't see banding on anything else other than the music app. At least severely. You can't get rid of banding completely on any panel. I understand that, but it's quite severe when playing music. Have you played music yet?