Almost exactly a year ago I posted this same question on this forum.
https://en.community.sonos.com/topic/show?tid=6863655&postid=16569705
The suggested answer, which worked, involved being sure that TV Auoplay was selected in the Beam settings.
What incited the problem last year was playing music via AirPlay from my Mac.
Now, a year later, it has happened again. I played some music from my Mac on the Sonos using AirPlay.
My Dish Remote suddenly stopped controlling the volume coming from the LG TV via HDMI ARC to the Sonos Beam.
This time, TV AutoPlay was already on.
The only way I can controlled the Sonos volume is with the LG TV remote.
I would appreciate any suggestions re how I can return control of the Dish to TV volume to the Dish remote.
Clearly, something about playing music via AirPlay to the Sonos disrupts something in this complex Dish-LG TV-Sonos ecosystem!
TIA again
Caroline