Plex client - Fire TV 4k Max Sudden big issue

Server Version#: 1.31.0.6654-02189b09f
Player Version#: 9.15.0.38159

I use Plex server on my desktop PC, and my client on my fire tv 4k max, all connected on a 1Ghz LAN network.

Everything was working smoothly, until today and it is driving me nuts.
For some reasons, I have buffering with no playback, literally endless buffering, when trying to play 4k movies with Atmos (Truehd 7.1) audio.
If i try the same movie and change the audio stream to 5.1 or DTS its working just fine.
It really is driving me nuts, it was butter smooth for years until now.
Please, any help?

Same problem here, same model 4k Max, same server and player versions installed.

Everything went fine until yesterday, when suddenly all movies with TrueHD 7.1 don’t start, keep buffering forever. Same movies play fine when changed to AC3 5.1.

Maybe a hidden update from Amazon which broke TrueHD 7.1 reading/decoding?

Are you seeing similar error as Most playback on Fire TV failing due to audio error ?

How can I find the logs ? I cant confirm without the same error in your logs, but for sure on my setup, this only occurs when trying to play TrueHD audio stream, no issues whatsoever with DTS MA, DTS X etc

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