Hi ​​​@John Ham.

Welcome, thank you for reaching out to Sonos Community.

Have you already tried to open this link under the Sonos help page? 

Hope this can help: Use an LG Magic Remote with Sonos home theater speakers.

Let us know if it works. If you need help with any other information, please be sure to let us know.

Thanks, I have tried this but it didn't fix it.  The TV responds when I change the volume - you see the icon to indicate you've changed the volume up or down - but the volume doesn't change.  

Hi @John Ham.

Welcome, thank you for reaching out to Sonos Community.

Since it started after you updated your Sonos application, I would like to recommend calling our customer phone support on this so you can be assisted with more thorough and in-depth troubleshooting steps as well as a remote diagnostics that can be remotely gathered from your Sonos devices with your permission.

Let us know if it works. If you need help with any other information, please be sure to let us know.

Just FYI - after a week, the problem went away by itself.  No idea what fixed it but it’s back to normal without me doing anything !  

Hi @John Ham.

Welcome, thank you for reaching back to Sonos Community.

That’s great news, what I'm thinking here is there might be a software update came from your TV company that fixes that bug.

Well since all are good now.

If you need help with any other information, please be sure to let us know.

Hi - the TV has updates disabled to try and avoid scenarios like this!  And unfortunately the problem is back. 

I’ll try and call your support, but the hours (for English) don’t overlap well with my free time.  Didn’t you used to be able to submit help requests online?