Have you previously raised the issue with Sonos Support and submitted diagnostics?

Unless an issue is raised with Sonos, they are unlikely to know of possible sound issues occurring with your existing television.

Same issue but I had no issue with the old ARC but since we have the ARC Ultra we have this issue. Also the interval is not always 20 mins, sometimes shorter.

Issue is occurring on tv apps like Netflix but also on hdmi devices or NAS.

Tried another new ARC ultra but same issue. Samung Tv is 1jr old and using stnd hdmi cable that came with Sonos and I have passthrough sound enabled.

Still have the old ARC on another tv without any issue so I still want to do some more testing but my gut feeling tells me it's a software issue

I also experience more drop-out in sound now than in my old Arc. Before it was only with uncompressed Dolby Atmos content every 20 minutes. Now I get them from TV apps like Netflix, Prime and Disney Plus as well. 
Sonos and Samsung really need to communicate and find a solution. I also think it’s a software/firmware issue. Especially with the eARC port. The dropouts are most likely some handshake issue or switching between TV and Sonos Arc Ultra at random. 
 

Do you use Samsung apps or Apple TV. Unfortunately the Arc has a long-running problem with Atmos that is encoded in the Dolby MAT format which Xbox and Apple TV use.

I use the Samsung apps. But I also watch 4K UHD blu-ray discs on my PS5 Pro. Should be TrueHD Atmos. I get the 20 minute interval between dropouts in sound with TrueHD. The dropouts on Samsung apps (Netflix, Prime, Disney+) are more irregular. I get no dropouts (so far) with PCM. But I didn’t get a Sonos Arc Ultra to NOT use Atmos. Or any other Dolby codecs.

Make sure the TV is set to these settings:

HDMI-eARC Mode: Auto
Digital Output Audio Format: Pass-Through

Then try this:

Disconnect everything from the TV and unplug the Arc Ultra and TV from power for a couple of minutes. Plug everything back in but keep everything disconnected. Make sure Anynet+ is enabled in the TV settings. Run TV Setup in the Sonos app and follow the app instructions. When the app instructs you, connect the Arc Ultra to the TV’s HDMI ARC/eARC port using the Sonos-supplied HDMI cable. After the Arc Ultra has been successfully connected, connect your other devices to the TV.

I tried this. Power cycling didn’t help, sadly. I even tried again. Still a dropout in sound after 20 minutes.

Try connecting the PS5 to a different HDMI port.

I have the same issue as above, samsung tv, sonos ultra and sound drops for a split second every 20mins or so. 

spent 40 mins on the phone with support today, tried power cycle, running diagnostics and no fix. 
tired new hdmi cables, different ports, no solutions. its almost to the point im going to return the Sonos sound bar for a different brand. I didn't spent all this money just to have it not work. 

I still have the same issue. It’s really a shame. I really like Sonos. But I also like Samsung tvs. Just a shame, they won’t work together for a fix. It’s either switch sound bar brand or tv brand and hope for the best. 
 

I have run many diagnostics as well to no avail. Power cycle…. New hdmi cables.. different ports. Still sound drop out with Atmos content and random drop outs with other bitstream content. No problem with PCM, but I didn’t get a Sonos Arc Ultra for PCM with no Atmos.

I have been on the phone with Sonos twice both for 40mins sending Diagnostic data to them multiple times and at the end of the second phone call they told me to swap the sound bar over (as it’s only 1 week old) 

did that yesterday and would you believe it, it solved NOTHING! 
Still the same exact issue of the sound dropping out. I am going to spend the weekend on the phone now with Samsung because this is crazy.

if I can’t get an actual solution I will be returning the Sonos arc ultra for a refund 

 Thanks for the warning.  I will NOT buy a Samsung TV.

I get the same when using my PS5 plugged into a LG Oled. Have to unplug the hdmi cable to solve the problem. I don’t think this is a Samsung only problem. 

Do you have the Digital Sound Output setting set to Auto or Pass Through?

I tried both. Same issue. It only happens occasionally though. 

​​​​​​Tried all above reactions with no luck.. 

I was so f tired of the sound cut I moved the old ARC back to my living room (where I have the Samsung tv and the new ARC ultra to gameroom where I have the LG tv.

Guess what, the sound is Christal clear now on both TV's...

Conclusion:

Samsung QN93 + ARC ultra = sound cut

Samsung QN93 + old ARC = no sound cut

LG OLED C16 + old ARC or ARC ultra = no sound cut

​​​​​​Sound from ARC ultra back to old ARC is really an downgrade but I'll take it any day over the sound cut for sure. For me it was sometimes even with 5 minutes of interval

I have been having the same issue with my Sonos Beam and my Samsung TV for years and have tried every option under the sun to try and resolve but to no avail. I really don’t understand why Sonos aren’t taking this issue more seriously and providing a fix themselves or working together with Samsung to get a fix…either way we want a fix and not having to spend hours with Sonos support without a satisfactory resolution !   Alternatively Sonos should state that the product might not work properly with Samsung TV’s in all their marketing details !  Sonos doing nothing about this is a really poor response given how much the products cost !!!!

Same exact issue with Arc Ultra and LG G4 using Apple TV. Pathetic that this is a long standing known issue and this company is dropping the ball. Own it and fix it Sonos!

Make sure the Digital Sound Output setting on the TV is set to Pass Through, not Auto.

On an LG G4 set to HDMI(ARC) output there is not a separate pass through option

Odd. What’s set under “Select HDMI Input Audio Format”? Bitstream?

Yes. Brand new LG 2024 77inch G4. Input is bitstream and unselectable. All output options also become unelectable once ARC output chosen.  

I recently got the G4 but only have the Playbase (optical) at the moment but I have the passthrough option. I would like to upgrade to the Ultra at some stage if they can turn their financials around. Let us know what happens.

So it sounds like the drop-out in sound is not only isolated to the Samsung brand, but also LG. 
 

Having set the digital output to Pass-through and bitstream and having the correct version of a certified HDMI 2.1 cable and having eARC activated and STILL getting the drop-out in sound… and having tried power cycling and resetting everything to factory default settings does sound like a firmware issue. Perhaps an issue that’s impossible for Sonos to fix…

There isn’t a Digital Sound Output setting on your TV?