Lost surround and sub ( after update ?)

Reading the 14.10 release note again, and thinking about the various differences in how each of us experienced this issue is interesting. I don’t feel like I ever experienced the delay or ‘echo’. Maybe a handful of times (less than 5% of my dropouts) I heard some poor audio that I characterized as a mis-mapping of channels and when restarting the stream to fix, immediately got a dropout. But it sounds like the root cause is the delay (transient processing or buffering glitch of some kind??) which the Sonos system seemed to handle poorly by dropping the satellite channels completely and then not self-healing? I wonder if the fix was more on the processing or buffering side or the handling/healing side. Maybe both? Might also explain why some users (myself included) attributed the issue to higher bit rate stuff like Dolby Mat (higher likelihood of processing strain?). And if the processing glitch was upstream of the Sonos device (TV or streaming box), could explain why some users attributed to Dolby vision or other high bandwidth video formats (sacrifice the audio for sake of video?). Also makes me think back to this thing on Nakamichi website I found:

Dolby Atmos MAT audio playback:

Some content devices output Dolby Atmos audio in "Dolby Atmos MAT" format, a new audio format that adds Dolby Atmos metadata into lossless pulse-code modulation (PCM) audio. The content devices are designed to prioritize internal buffering for high quality video when playing Dolby Atmos MAT contents. Therefore, the buffering process might cause random audio cut-outs. This is reported by various users with content devices that outputting Dolby Atmos MAT format

 Anyway, all just speculation for which we’ll probably never have a definitive answer.

The fun y thing about the "echo" is the first time I heard it was a scene in Apple TV's Severance.  I dont know if you have seen it, but it is a mystery type show and I actually thought the echo was someone's muffled talking in another room and thought I was catching onto a clue no one else had....sadly when I watched another completely different show and got the "echo" I realized how big of a clown I was.

haha yes I’ve seen it and can totally get it. That show begged you to try and pick out clues and make predictions and something subtle like a faint side conversation could totally contain a big clue. 

Well I had my first sub and surround dropout with 14.10.  It had been working perfectly but we were watching the Kenobi finale on Apple TV and that worked fine.  Then we started watching the new episode of Ms. Marvel and it worked great until half way through one of our kids came down to talk to us.  We paused it but the conversation went so long that the Apple TV turned off.  TV was still on but Apple TV was off.  Turned Apple TV back on and started the show back up and the sub and surrounds were gone.  Turned off the TV and turned it back on and the sub and surrounds returned.  Doesn't appear like 14.10 fixed all the bugs.  But until that incident tonight it was working.  Still can't trust it 100% like we used to be able to. 

Oh and I should point out that when we lost the sub and surrounds I went and used one of the physical buttons on the surrounds and it did mute the Arc so they were still talking to each other just no sound getting to them.

Hi @bschwartz 

If you are experiencing issues with your system, please contact Sonos Support with a diagnostic so we can help identify your specific issue and work to resolve it. The Sonos team is committed to resolving any issue you experience so you can continue to enjoy your music and listening in the seamless manner you should expect.

Sory to hear that. Anymore drops again or was it a one and done? Did you complete restart your system after the install? I had sub glitch when playing music and moving back and forth between my move and arc, but a complete system reboot solved it.

I 100% agree that 14.10 changed the overall mix.  I’m noticing way more coming to the rears than before, and slightly more stereo separation.  It all sounds good. 

No drops yet since 14.10 . My system was highly unstable with the issue, had a dropout every 5 minutes. 

Hi @Corry P , thanks for the update. My system has been solid since 14.10 . I did wanted to ask however that while upgrading from 14.8, the update failed. I then restarted the entire system and everything worked. Then while I was adding surrounds, they took forever and didn’t add properly. I did eventually add up factory resetting everything and the system works. No dropouts since but I  did want to ask that is 14.10 the final fix for dropouts? What changed on 14.10 that was broken in 14.6 . Appreciate if your support teams are fully updated on this, should we ever contact them again rather than them pointing the issues to be with our network.