There’s nothing really suspicious in the logs. I don’t see any audio transcodes, which implies the playback is not doing conversions, which makes me even more confused.
I assume there’s no reverse proxy or anything like that involved?
If not, and if you can reproduce the issue easily, play it on your phone, wait until it’s a minute or so over, and then send both server and Plexamp logs over.
Sorry I don’t have anything better to advise, you’re literally the only person who’s ever reported this.
