Persistent surround sound drop outs

I agree with ​@Airgetlam. When I wired my Arc I switched off the WiFi in the Arc settings. Then other devices need to go through the router instead of the own Arc’s network, so it didn’t sound great. 

Also check potential interferences or something which is demanding bandwidth if you connection is not good enough.

You can get a quick look at your wifi link status (if un-wired) from the App 

Airgetlam, Triticale and all - you nailed it for me!  Thank you so much!

My newbie assumption that the Arc’s wifi enable/disable option in the app refers to one’s own wifi (and hence should be ‘disable’ when hard wired to the router) rather than to the Sonos one was obviously wrong. Although I think my RTFM habits are reasonable, in my defence I have struggled to find a clear description of some of the app’s functional options anywhere in the Sonos documentation…

Again, my thanks for kindness in sharing your (doubtless hard-won) knowledge. I can now enjoy listening to it all so much more !👍

You’ve proven you’re human ;)

Glad it is working now!

Sorry for using this thread but i have the same issue.

I have Arc ultra + Sub Mini + 2x Era 100s.

Arc is on LAN, Sub mini and Era’s on 2.4Ghz WiFi.

WiFi in Arc settings is on.

Here is the link for the audio sample: https://streamable.com/wfu219

This happens on all sources and audio formats.

When i create a new system, only Era’s in stereo the sound is fine, no dropouts.

Era’s are some 3.5m from router, TP Link Archer AX5400.

Tried resetting everything, didnt help.

Does anyone have any ideas why is this happening?

Since you are posting to a topic the forum has tagged as "Solved" you may not get much visibility. Starting a new topic is easy and always recommended. If you want to reference another topic add a link to it.

You say you have the same issue, but then say your wifi is turned on?

What do the signal strengths show for each of your speakers? For the 300s both as part of the HT Room and as a Pair. This is under: room - product - network in Settings.

Have you tried NOT putting the Arc on your LAN? WiFi is usually a better choice these days.

Try turning off band steering/smart connect in the routers settings to see if that solves the issue.

 Navigate to Advanced > Wireless > Wireless Settings.

 Look for the "Smart Connect" or "Band Steering" checkbox/toggle and turn it to the off position or uncheck it.

Smart connect is turned off, if by that you mean auto combination of 2.4 and 5Ghz bands.

It's the same with it ON or OFF. Also tried turning OFF 5Ghz range and also changing channels to least congested ones, didn't help.

As the issue is non existent when speakers are used as stereo pair without Arc Ultra I don't think it's wi-fi issue.

In general, surrounds would connect to the signal generated by the soundbar, and not the signal generated by the router. You may want to check for wifi interference , particularly in the 5Ghz channel, although not exclusively. I’d also be tempted to reset the WiFi, by unplugging all Sonos devices from power, then rebooting the router. Wait two minutes before plugging back in your Sonos.

I’d probably stay away from forcing the Sonos Arc Ultra from connecting to a 5Ghz signal, and let it connect to a 2.4Ghz signal when it’s necessary, to allow it to use its 5Ghz channel exclusively for the surrounds. Could be a false ispdea, but I’m a belt and suspenders guy, and when using tech, I try to be with the grand majority, rather than the ‘special case’ users, since that’s what the device/software tends to be designed for. 

Thank you all. 

It seems that disconnecting the LAN from Arc and connecting it to Wi-Fi sorted the issue out. It's been working fine this whole day.