I ‘sometimes’ see this message too (in similar circumstances) with an LG OLED C9 TV, but in the case here, it’s an HDMI-ARC/eARC cable connection.

I’m just pondering if this is perhaps ‘by design’ in the Sonos App and intended to give the user a ‘get out’ option to maybe not interrupt any potential playing TV audio, if the wrong room has been selected by mistake in the App by the user for music playback …(not sure?)

Turn the TV off at the wall.

This happens when the TV is set to “Off”. Once it has accessed the optical out, it does not seem to release it...

Not in standby. Actually powered off. The TV can't output an optical carrier if there’s no power. Some devices keep the optical alive (a red light shows at the end of the cable) when in standby.

got it, unfortunately modern TVs do not allow complete power off anymore apparently. At least i do not see this option on my Set (unless unplugging power which is not an option)

Fully OFF implies that the TV could not respond to remote control commands.

I think that the assumption here is that TV is the most important function and if TV watching is interrupted, domestic unrest will follow.

A simple “do not show this message in the future” toggle in the sonos app would solve the annoyance :-) 

You’ve presumably tried powering the Playbase off for 30 secs and restarting it.

no haven’t tried that. I did not touch playbase. Just swapped the TVs. 

I noticed that after roughly 10min the TV releases the optical output, so in practice this <problem> is not a big issue…. Case closed. 

Actually it’s not the TV that releases anything. The Sonos home theatre speaker stops streaming the TV input after ~10 mins of no signal.

ah ok. Even better. Thanks