Apple TV 4K audio lag, out of sync

Server Version#: 1.21.0.3744
Player Version#: latest

This is an ongoing issue with the latest apple TV 4k, latest plex player. Audio is out of sync on most movies in 4k (mkv 1:1 copy, pass through, no encoding) and some in 1080p. I have a 1Gb network entirely, all wired and I have run speed tests repeatedly on my network and it is blazing fast. Running on a synology disk station 1515+ (server), all settings are pass through/direct play on the server as well as player. Yet the audio is always out of sync on most movies. I’ve tried closing all apps out, restarting the apple tv. I’ve tested the video with lower end players (vlc) on a computer and they are perfect. Also I’ve used infuse 7 on the apple tv streaming from the plex server and all movies play perfectly. So I have isolated the issue to the plex player on the apple TV 4K. It makes no sense that lower end players have no problem, but plex, a high end player has trouble.

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