Synology NAS and PAID Plex Server connected to AppleTV 4k with Plex won't play movies/shows

Reliable use for 5+ years on PMS/Synology, but now having a really bad issue. I use AirPod Pros all the time. I was using a new AirPods Pro and switched “head tracking” in the AppleTV menu. When I did the audio dropped. From then on, about half the movies and shows on the Plex/Synology won’t play. The movies/shows load, I can fast forward through frozen stills of the movies/shows, but they refuse to play. I can see the whole movie/show is loaded on the AppleTV/Plex Player, but random files won’t play. All the files are .mkv so not some odd file type. Ideas to figure this out? I can Airplay from iPhone Plex App to TV (Sony Bravia 86"). no problem on the same files, but those same files refuse to play on AppleTV 4k Plex Player.

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