My setup: (all latest firmwares). 100% streaming through ATV4K. Mainly YouTubeTV, Netflix, HBO, AppleTV+.
ATV4K → arcana input.
Arcana eARC out → Sonos Arc.
Arcana HDMI out → LG B8 HDMI ARC
problem: when tv is turned off (sleep), when powers back on, ATV audio setting has turned DA off and no sound through Sonos Arc. If I restart ATV4K, DA comes back alive and sometimes then works perfectly until next sleep cycle or the DA sound is very broken. Then if I unplug the Sonos arc, it works perfectly.
note: this started between May 2021 and Feb 2022. I was not using ATV during this time. Worked perfectly before this time. Same 8K ultra fast HDMI cables as prior.
any ideas what might cause this. Appreciate any advice..