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My Setup:

Plex Media Server + Nvidia Shield + TV(not eARC compatiable) + Arcana + Sonos ARC

 

Previously this setup was playing my 4k Atmos TRUEHD content no issues. But recently it stopped playing it all together. Will only play content if I switch the audio stream to AC3. 

 

I read this thread below and it seemed to be pointing to an issue with the latest 13.x Sonos firmware causing the issue. So I updated my Arcana firmware to .84 but it doesn't seemed to have fixed the issue? Am I missing anything in terms of Arcana settings to get this working?

 

 

I’m not using PLEX and I also have ARCANA (running v0.84) and a TV that does not support ARC. I haven’t figured out the exact drill, but occasionally I must reboot ARCANA in order to restore audio.