How do i stop my Sonos Arc from resetting its volume to zero when I turn off TV?

In my opinion you should be careful what you wish for. In my area the cable box will update in the middle of the night and then turn ON. At this point the TV will assume that the viewer wants to watch TV and it will turn ON and pass audio through to the soundbar. This is not what I want and I must make a point of setting the soundbar’s volume to zero as I end each viewing session — else the next session, planned or not, might come through with an inappropriate Volume level. I would appreciate this ‘auto zero’ function.

@buzz 

Are you serious??? Who’s your cable provider. I want to make sure I don’t use their service. 😂😂😂

Thanks for the feedback!  For sure I don’t want the volume to start blaring in the middle of the night!!  Doesn’t sound like there is a very good fix for this nagging long-standing problem with Sonos equipment (at least for some of us)?

It depends on what is causing the issue. Submit the diagnostic, call Sonos. They’ll suggest either a fix or no fix, depending on which issue it turns out to be. 

 Comcast/Xfinity. This characteristic could be different in different areas.

There is a communication path in HDMI cables, known as CEC (Consumer Electronics Control). It’s slow (417 bits per second) and crude. It’s basically an announcement, such as “I just turned ON”. The other components will decide what they will do with this notice. You can insert a “CEC Blocker” in a unit’s HDMI connection to prevent these transmissions. In your case you could block CEC to the soundbar. You would then need to switch to IR Volume commands for the soundbar. Since most hand held remotes support this and the SONOS soundbars can be trained to accept IR Volume commands, most users will not notice the change.

It must be. I have the same service and it’s not occurring on my TV. 🤔 

Does it occur on just one TV or others in your home as well? I ask because I had a similar issue that I resolved and it only occurred one TV. However, I didn’t attribute the issue to Comcast/Xfinity.

This could also be a characteristic of a particular cable box model. Anyway, there is only one TV and we dumped Comcast.

I’m seeing this same problem on an Arc and LG TV with no cable box.  My setup is simple… HDMI from TV to Arc.  I use streaming services and without fail, the volume gets reset zero after a 10 minute pause or if I shut the TV off.  Sonos support first told me it was my TV remote so I eliminated that by removing the batteries and using my phone with an app.  Then they told me it was my internet provider but I have no other issues, a strong connection and never experienced any problem with my Beam soundbar.  The latest “fix” was to disable TV Autoplay but I’m still able to reproduce the problem without fail.  Numerous diagnostics have been submitted but I’m getting nowhere and spending way too much time on this.  

Just started having this problem since I rebooted my Arc as a resolution to a crackling noise from one of the side firing speakers. All very strange, all was fine until then. Also may be linked to latest app which upgraded around about the same time. Nightmare with Sonos lately. Cannot play my locally stored music which was absolutely fine on previous app and now volume defaults to zero every time I switch off my tv.

I will be contacting Sonos support on Monday but not at all hopeful.