Here is one problem I noticed with my Arc + Sub + One system. The Arc connects with my LG C8 via HDMI cable to ARC. Every time I power on the TV, the sound switch back to “internal speaker + optical” audio option. I have to manually switch it back to ARC . However, after I am done this, the Netflix won’t show Atoms instead of showing 5.1 (the sonos app shows DDP 5.1). Then I will need to switch between internal speaker and ARC couple time, switch on and off for Dolby Atomos setting for internal speaker, reload Netflix couple time to get the Atomos sign back for Netflix and sonos app.
Can I get some help with this issue?