Sonos volume changes on its own during playback

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Moderator Note: Modified in accordance with the Community Code of Conduct.

CEC wouldn’t be an issue when listening to music, as the OP stated was part of the issue. 
 

I’m certainly not aware of it as a ‘common issue’.

Thanks for the suggestion. I’ll reach out to the Community Center of Excellence and share the details there. Hopefully they can help look into this further.

I have what sounds like the same issue with my Sonos speakers. I have four speakers and every so often the speakers volume will just lower on their own. Out of the blue I will wonder why I can’t hear the speakers in the other rooms. I’ll look at the app’s volume and for some reason they will be showing the volume setting lower.

For instance, I will have the speaker in my office at about 10 because it is a smaller room and will have my other three speakers set at 20 because they are larger open area rooms. Out of the blue the speakers will lower the volume to 5 on the one that was set at 10 and the others (20 volume) went to 12. No one else in the home to change any of them and I did not change the volume in the app, but when I looked as to why I wasn’t hearing them as loud the app is showing the volume is lower.

What did Sonos support say? 

Again, hard to tell from an anecdotal perspective. There are three things I’m aware of that can alter a volume in Sonos. 
 

1. a voice command system installed, and a recognized start word (including incorrect ones)
2. a controller (you can have up to 32 connected) changing the volume, there is no restriction to a single ‘remote’.
3. some oddity with the sensors that control the speakers themselves. Most often in the past, this has been an animal stepping on them, but there may have been odder ones. This can easily be controlled by turning off those switches in the controller, in the room settings for that group.

But as ​@nik9669a suggests, the best way to find out what’s going on is to call Sonos Support to discuss it. So far, there hasn’t been an issue in the Sonos software, but anything is possible, no matter how unlikely. 

I appreciate (actually love!) the ability to call Sonos support and be able to talk to someone each time there is an issue.

But it becomes a nuisance to have this as being the answer every time to every issue with the Sonos speakers. It would be nice to be able to get answers to an issue online every now and then without having to call support to get a resolution; and after having to do multiple tests and or calls.

On a side note, on one of my previous different issue support calls (about a year ago) I made the suggestion to have the volume controls be easier to toggle through to select a specific volume level and be able to lock the volume levels. If this suggestion would have been taken and implemented, us Sonos users wouldn't be having this problem of the volume just adjusting on its own.

To answer your questions…

1. a voice command system installed, and a recognized start word (including incorrect ones) - The only voice command system I use is the Sonos speakers voice command.
2. a controller (you can have up to 32 connected) changing the volume, there is no restriction to a single ‘remote’. - I only use one controller; the Sonos app on my phone and only 4 Sonos speakers.
3. some oddity with the sensors that control the speakers themselves. Most often in the past, this has been an animal stepping on them, but there may have been odder ones. This can easily be controlled by turning off those switches in the controller, in the room settings for that group. - No pets or anyone else in the home.

In most cases, this is caused by the TV connection. If you are using HDMI-ARC, the TV or the remote control, then it may be changing the volume automatically via CEC. You can try turning off HDMI-CEC in the TV settings and see if this stops.