It could be any of several things, unfortunately. Can you define what you mean by ‘turning off and on again’, please?

Since we don’t have access to the hard data, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here, they get sensitive about GDPR.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

By turning it off and on again I meant unplugging the system from the wall.

The issue is the audio drops out completely for less than a second Intermittently. Happening on all devices and ports.

I’ll get in touch with sonos today after it happens again! 

Bumping this as still need help.

I spoke to sonos chat who advised me to remove the switch 2 hdmi cable and see if it’s still happening. Well, I did that and alas audio still cutting out intermittently. 

Now, I knew that made non sense but went along with it anyway. They told me they were no issues when they ran system diagnostics.

Today, I changed the HDMI order back to what it was when it was working (except, Switch 2 for 1) but still the problem is here. 

Should add that I’ve doubled checked my webos settings and can’t see anything amiss.

Any ideas? ​@Airgetlam or anyone else

I’m not a fan of “chatbots’, so I’d want to actually speak to a support person verbally, even though sometimes they’re not as familiar with networking and the way Sonos works as I am. But their access to diagnostic data is better than mine.

I’m going to hazard a guess here that there may have been an update to your LG’s CEC system that is now interrupting output to your Sonos. So, I’d suggest a couple of things, some of which you’ve already done, but would need to be done again.

First, check your TV for updates, and apply them. Second, check your Sonos for updates, and apply them. Then do the whole ‘unplug from the wall’ thing, for two minutes at least, to both the TV and the Sonos. Make sure you leave this Switch 2 disconnected, we don’t know if this device is causing a conflict in the CEC system in your TV, at least yet. Our primary goal for now is to get your Sonos working properly, then introduce other variables, so we can figure out where the issue is. Finally, I think, reseat all your cables, to ensure their all at least HDMI 2.1 and seated in their respective ‘sockets’ properly.

Rather than talking to ‘chat’, I’d also call in, and speak to a human. As good as AI can be, it isn’t always perfect. Of course, we humans aren’t, either.

Not that it’s much help, but I’m not having any issues with my LG at this time. But I haven’t been messing with its connections, either. Or updated it recently. But it’s connected to an Arc, not a Beam, but they both operate the same software, and both connect via HDMI-ARC. 

What are the source devices?

Have you tested with a single source connected directly to the TV?

​@Airgetlam I will try your suggestions. Will try turning off CEC on Switch 2 as I never had that on with switch 1.

I don’t have my tv connected online, so I will update it, later and see if that makes a difference.

Thank you for all your help.

I have not tried single source, yet.

I have apple tv, ps5, Xbox series X and Switch 2 connected. Switch 2 and xbox are connected via a hdmi switcher. Which, has not caused any issues in the past.

I have an update!

After further investigation, it looks like the audio drop out is happening on Apple TV and not other devices hooked up to the tv. It started to happen when I got switch 2 and moved apple tv off the switcher I had it in and put it in another port. 

Seems crazy that I would have less problems while it’s was plugged into a HDMI switcher rather than directly in the TV. 

Any ideas on what could be causing the audio to drop out on apple tv? It’s happening with dolby atmos. Around every 20 mins, there will be a quick drop out of audio. Not 100% if it’s happening on other sources, yet. 

I’ve double checked settings on Apple TV and TV and nothing seems amiss.

I did not say earlier but my tv is an LG C2 that has not been connected to the internet for months. So, I did that today and updated.

I’ve also switched HDMI ports. I’ve put the Switch where the Apple tv was, so I can rule out if it’s a problem with just that port. I’ll report back on that.

​@Airgetlam ​@buzz or anyone got any ideas for what else I could try?

I think that one or more of your devices wants to be in charge and will send an occasional CEC (Consumer Electronics Control) command over its HDMI connection. Maybe it’s an extraneous command and one or more units react poorly to the command. The CEC goal is for the operator to simply drop a disc into a player (or similar) and the system will power up and select necessary inputs. Standardization of the CEC commands is fair at best and there is opportunity for mayhem. Also, signal transport of CEC commands on the HDMI cables is not very robust. In your installation of multiple HDMI switches there are additional HDMI cables and “boxes” that could result in enough CEC signal degradation to cause trouble. Your observation that moving a connection point changed the symptoms reinforces my suspicion.

You can continue to experiment with shuffling the connections. Maybe this will result in good behavior. Another approach is to insert one or more CEC blockers to isolate the poorly behaving device(s). I would start with the AppleTV.

And, in addition, I’d still call in. We just don’t have access to the data in a diagnostic. 

I did do the system diagnostics over chat and no issues were found. However, IIRC this was not done close to one of the drop outs.

Can now confirm that audio still drops on apple tv after changing HDMI port. I’m baffled by this as it was working perfect. Even unplugged the the switch 2 from hdmi.

​@DannyUFCfan 

The Apple TV box does have a known issue when watching content in Dolby Atmos that in some setups with soundbars (as it my household annoyingly), sound will drop for a second about every 20-30 mins of content.

There appears to be no fix on earth, so I just get on with it… It’s only with Apple TV box/Dolby Atmos content on soundbars it would appear. Not sure if it’s limited to Sonos soundbars or not. 

As previously suggested, don’t do ‘chat’, call in. 

Full disclosure — I’m not an Apple TV user.

I’ve poked around a bit and this seems to be an Apple TV issue — regardless of the playback system.

Really? Even if it was working perfectly ever since I got this set up?

Either way, I might be getting somewhere! Spoke to sonos via chat, this evening who told me that they ‘detected an interference with the connection of your speakers’. So, I’ll reboot my router, tomorrow.

I guess, if it comes to it and the issue is wi fi related, I could go wired? 

Why would the issue be WiFi related? You are using an HDMI connection for the Apple TV and other connected devices.

Well, they told me to reboot the router so they obviously think that could be the problem. You don’t think it’s wi fi related? whole system is connected via WiFi, no?
 

I’m going to try later, so we will find out then.

​@DannyUFCfan - you may like to try a reset of the Beam and you TV.
There are a lot of issues reported that are likely solved by this tasks.
This may like issued by replacing devices, or playing around with it when you changed your setup or just have a new one.
I had an issue with pumping sound I found reported by somebody else and the suggested solution was factory reset of the Arc. That worked for me.
Same time I had this sound drop outs as well. For the moment it seems to be solved ty the factory reset by the Arc as well.
Originally I found this sound drop out issue with suggesting a “soft” reset of the TV. Means pull power, disconnect all devices, connect power and all sources again.
That was not needed for me. Maybe because I decided when adding the Arc again to pair it with my TV directly, which may cause some specific reset of port/device.
In worst case you could try a factory reset of the TV. But keep in mind to save the screen settings.

Thanks. I’ll try a few more things and report back. I do have the option to have a wired ethernet connection instead of wifi, if people think that will help?

I had drop outs even Arc and Sub connected via cable. Just the ERAs wireless because don’t like the adapter.
But give it a try. I would try with the reset first.

Some good news! I’m going to touch wood, but I think rebooting my internet has fixed the issue. It’s partly, on me for not doing this simple fix earlier. Nothing had changed with my internet, which is why I didn’t  think to reboot it.

I’ll bump this thread if it comes back. Thanks for everyone’s help on here. 

I reboot my gateway/routers once a month, otherwise things can start getting weird. In my workplace i can’t blame SONOS because there are no SONOS units. 

Sigh, I spoke too soon.

I thought I was safe after rebooting router as I went over an hour with no drops, but watching another movie tonight and it’s back.

Next thing to try is to connect the Beam 2 Via ethernet. Does that sound something that will work or I’m I wasting my time?

If that doesn’t work, I may well sell this pos. Life is too short :)

Edit:  chat told me that ‘the diagnostic is detecting potential issues with the bandwidth and some wireless interference around the Beam in particular’.

I wonder, since the problems started with switch 2, could that console be causing the interference in any way? 

I will try wired tomorrow and unplugging SW 2.

​@DannyUFCfan 

You’ll not fix it. If it is indeed the one second drop out every 20-30mins during Atmos on Apple TV through a soundbar, then you’re stuck with it, just like me and thousands of others.

Wait, is it a known problem? Can you expand, please? A problem that just suddenly appears?