Arc Ultra Surrounds/Sub Disconnect Almost Daily

Since you aren’t willing to consider it possibly being an issue with Sonos interacting with your network I can’t help. If you are open to suggestions on that topic at a later date let us know and there are options to explore.

I agree with ​@Stanley_4 you need to be open to suggestions. Here’s one… Remove the SonosNet. Make sure that WiFi is enabled for all speakers in the App. Place all Sonos onto your WiFi. That’s a starting point.

There are other possibilities involving the AiMesh. I know of what I speak as I use an Asus AiMesh WiFi 7 setup. 

Do you have a Guest Network enabled?

There have been previous reports where surrounds/sub disconnect when a guest network is enabled.

Definitely happy to make additional network tweaks or check router/Sonos logs! What do you suggest?

However, the Asus<->Sonos network links are rock solid. Arc Ultra, Era 100, and Roam don't have any issues on the main Wi-fi network, don't fall off, and all features work as expected. The challenge is that the Sonos<->Sonos network links (between Arc Ultra and surrounds/subs) consistently fail and remain failed until the Arc Ultra (not the surrounds/subs) is hard power cycled.

If a hard power cycle of the Arc Ultra alone can fix that Sonos<->Sonos network link, how do I diagnose what's cause the link to fail in the first place? Seems like a stretch to assume that my Asus network is reaching in and breaking that link by itself. Is the problem a software issue in Sonos' networking stacks? A hardware issue in the Arc Ultra PHY? Environmental interference that Sonos isn't resilient enough to self-repair without a power cycle?

Thanks. I’ll try removing SonosNet entirely.

To ​@Mr. T, I do have a guest network enabled, though obviously am not using it for the Sonos speakers themselves. Can try disabling it. Though, were those previous reports about a problem that only occurred every 24-48 hours? Or immediate symptoms as soon as guest network was enabled?

I could also force the guest network to 2.4 GHz only. The links between the Arc Ultra and bound speakers are 5 GHz only, right?

I don’t know the timings, but it was previously reported here:

There are several good suggestions so far. I agree that the difficulty probably lies with the Arc or the Sonos 5 gHz link between the Room's members.

I don't suspect the router's radio or the channels it is using are part of the problem, what may be an issue is the Arc switching the wifi connection between the hub and remote AP. You can look at that by checking the BSSID the Arc is connected to when working and when failing. A possible issue there would be IP address related, some small number of users see issues that may stem from when the router's DHCP server assigns random addresses as the networking path changes or as scheduled. This is very hard to diagnose but a simple workaround exists, assign all Sonos (not just the iffy ones) a static/reserved address from the router's DHCP Settings page. Power down all Sonos Reboot router and controller then power the Sonos back up. 

Edit, forgot you had tried this.  It would be interesting to try power cycling one of the surrounds or Sub and seeing if that triggered a reconnection.

Not related to your issue, but I noticed this while looking at possibilities, in the networking section of the settings the BSSID on the Sub or surrounds isn't changed to the Arc's hidden one when playing 5.1 content, but still shows the wifi's BSSID.

Thanks ​@Stanley_4 . Unfortunately, I’ve had static DHCP assignments for all speakers for years, so that’s already been ruled out as a solution.

I tried power cycling one of the surrounds when the 3 speakers went offline last night - it did not bring anything back online. Maybe I needed to try power cycling all 3? As usual, power cycling the Arc Ultra itself did bring things back online.

For now, I’ve disabled all guest networks and removed SonosNet from the equation by turning off wifi in the Symfonisk Lamp that was generating SonosNet. Will see if this solves the disconnects.

I’ll look at what BSSID the surrounds are connected to as well.

For whatever it’s worth, I had previously test driven a non-Ultra Arc in this same space and with this same network (though with Symfonisk Bookshelf Gen 1s rather than the Gen 2s I now have; same Sub Mini). The non-Ultra Arc did not exhibit these issues. It does kinda tempt me to return the Arc Ultra and just go back to an Arc.

Hi ​@shutter41 I have the same issue with a Beam that disconnects from 2 x ERA 100 and a Sub Mini, this started when the system automatically upgraded to the latest firmware. All of these are on the “latest” product stream.

This does not happen to an older setup that I have, PlayBar, 2 x Play:1 and Sub. All of these are on the legacy product stream.

As I only have to power off/on the Beam to get everything working I have decided to live with the issue and see what happens when the next firmware release is delivered. If the problem persists after that I’ll call Sonos support, assuming that the queues are not too long, to see what they say and what is required to fix the issue permanently. 

If your latest tweaks don't stabilize things wait for the issue, submit a diagnostic and call support, request they find and solve the issue or send you a replacemment Arc.

When its ‘working as expected’ is the source TV (eARC) or streaming music?

Arc can only connect to a 2.4GHz network, Arc Ultra can use 2.4 or 5GHz, so even though it was in same location, it would be possibly connecting to a different band (network)

https://support.sonos.com/en-gb/article/supported-wifi-modes-and-security-standards-for-sonos-products