I have a similar but not quite identical issue with a new AppleTV 4k. I stream music around the house from an iTunes library on my computer. 3 of the AppleTVs stream fine. Only the new AppleTV 4k will more often than not play the first 5-10 seconds of a track, then go silent. When the track changes, I'll sometimes hear a few seconds of the finishing track, then 5-10 seconds of the new track before silence.
Stopping / starting the music stream on the computer (I use Remote) restarts the music on all the devices. Sometimes the 4k will play for a few tracks but eventually it always stops again.
The new 4k is in a location where I had an older generation ATV that worked flawlessly. The older one is now moved to my garage and still works well. I'm hoping there's a setting on the ATV I'm missing but an hour or two of tinkering hasn't helped.
console.log is chatty regarding iTunesHelper but I don't recognize the service names and can't correlate the sound drop with the logs since the 4k is in a different part of the house.