I’m having the same issue. All of my Sonos devices will randomly appear and disappear out of the app. Also there isn’t alignment on the desktop app to the mobile app on what Sonos devices are available. 

ISP: Spectrum

Router: SAC2V2S 

Sonos apps: up to date as of writing

Sonos Devices: One gen 2 (x2), Bean gen 2, Move, Roam (x2)

Mobile: iOS 16.5

Desktop: Mac OS Ventura 13.3.1 (a)

I have 2 iPhones, 2 Apple Watches, 2 Apple TVs, 1 Macbook Pro, 1 PC, 1 printer, 1 garage door, etc and none of them have issues with the network. I also have another house full of Sonos that works but it’s on AT&T fiber. Not sure what the router is. 

Have done unplug/replug, reboots, factory resets, software updates, been on the phone for about 3 hours total now in addition to all of my own troubleshooting. Spectrum said they can’t split the network as Sonos has asked, but they can “guide” individual devices to use the 2.4 vs the 5. However, Spectrum also said that the Ones don’t appear to be capable of 2.4, they could only to 5. Hmmm...

Still working with Sonos’ escalation team who is asking the engineering team for help. Spectrum is sending out a technician as well. Getting good help now that I’m up to the escalation team but I don’t know if there will be a palatable solution.

To me, wiring all of these devices is not a solution. That defeats a core purpose of Sonos.

Permanently keeping a device plugged into my router is also not reasonable. Sonos has suggested this as it apparently helps the other Sonos speakers. In my opinion, having something plugged into the router to help the Sonos system achieve “Effortless Listening” as is advertised on the website should be supplied by Sonos free of charge or included in the first place.

Fingers crossed for a clean solution that doesn’t involve spending more money or wasting a device. 

Just replaced my spectrum router this past weekend because Sonos customer service mentioned it’s a known issue with Spectrum routers; I always had at least 2 speakers missing! When I added two Sonos era 100s in December, the situation only got worse. I was really getting ready to return them. I have 5 Sonos speakers and was suuuper frustrated.
 

 I tried the NETGEAR router mentioned in this thread, but it didn’t work for me! Maybe I got a dud because I bought used from Amazon.

I caved and bought an Eero router fr Best Buy and omg, I wish I did this sooner…returned rented router to spectrum today. Good riddance!!! 

Replaced my Spectrum SAX2V1S with a TP Link AX1800 ($85 cost) and my Sonos connectivity issues disappeared.  Not sure what the problem was with the Spectrum router but cost of new router was way worth the time saved in fussing with the Sonos app on speakers disappearing.

At least you don’t have much WiFi interference. Currently I’m in an urban area. I have fiber — that’s great. On the not so great side — at times I can see about 70 access points; a combination of home mesh systems and a medical facility next door. There are a few “smart guys” who are using channels 8, 9, & 10. I suspect that some of these are “auto”.

Sadly this did not resolve the issue.  I’m thinking the change in router setting just did a restart of the router which made it “work”… for a while.  By the next morning, the same problems were occurring.

The odd thing is that each Sonos device remains connected to the router just fine.  I can press play and each one will resume playing the last station or playlist.  The problem seems to be more with the app not being able to connect to the Sonos network.

Really wish someone would figure this out!

I had this same issue trying to set up two new Era 100s (my first Sonos products) - I called spectrum and had them manually switch my phone to the 2.4 gigahertz band so I could finish the setup but as soon as he switched it back to 5 the app could no longer find my system (even though the Era 100s allegedly work on both bandwidths. I bought a new router to plug into my spectrum modem (NETGEAR R6020, was $36 on Amazon) and renamed the network to my original network name, and everything immediately worked - I didn’t even have to create separate networks for each bandwidth!

UPDATE: my phone has reverted back to 5g and the sonos still works.

The reason I had to factory reset my sonos is that when trying to pair to the new wifi, they were still stuck on the old “system” and router. Do what works for you, just giving you my experience.
 

Happy listening. 

I did this (enabled UPnP) and thought it was working for a bit, but then started having the same problems. Then I saw on another post, and remembered from issues I had years ago, that the best and easiest fix is to plug one (yes, it works with only one) of your Sonos speakers into your router with an Ethernet cable. Your Sonos system will create its own network, and just like that, all your router problems solved!

The older SONOS product will build its own private wireless network, SonosNet, when one or more units are wired to the network. The newest units, such as the ERA’s or any of the portable units do not support SonosNet. Using a SONOS USB network adapter, you can wire the ERA’s and MOVE 2. Otherwise, the newer units must use WiFi and, if you search, there lots of Internet “fires” burning around the SPECTRUM router.

If it was my system, I’d disable the SPECTRUM’s WiFi as much as possible or ignore it and install my own router. Actually, I’d avoid SPECTRUM if possible.

Been having similar issues ever since we got a new Spectrum router.  All three Sonos devices appear to be connected to the router, but fall in and out on the app.  Seems very random, with constant “connection” issues… at least as it appears on the app.

Tried this today and so far it seems to have fixed the problem!

In the My Spectrum app, clicked on Router and Advanced Settings.  There is a setting there called UPnP (Universal Plug and Play), which “enables devices on your network to find each other and communicate”.  This setting was disabled… enabled it, and after the router reset now everything works!

Hopefully it continues, but so far its working consistently.

Having the same issue!  

Have 6 speakers: 4 Sonos 1’s, Beam and a Move.

Router is Spectrum model: SAX2V15.

Spoke to Sonos said that I have to have the ISP separate the bandwidths (2.4 and 5ghz).

ISP Spectrum says that I need a router that has a dual band option… That the modal has a feature called “Advanced Home Wifi”. That this router is not capable of separating the badwitdhs.

Sonos say’s it can be done. Who is telling the truth?? 

Anyone find a solution with this type of router or should I have to spend money on a different router to support the Sonos system? 

99% of them. It’s more appropriate to ask which routers have issues, and that data is now somewhat obscured. You can look up, using the search on the FAQ, the word ‘compatibility’, and you’ll find a list of articles about a very few routers. 

Hello,

There are known Wi-Fi issues with Spectrum routers. See Incompatible hardware with an available solution

The general resolution is to use Sonos in a wired setup.

I am having the exact same issue. Has there been a resolution?

From time to time ISP’s have issues with their routers. At one point my ISP’s router was the subject of blazing Internet fires. I eventually developed a habit of resetting the router once a month. It wasn’t just SONOS that had issues. I kept using that router for a while at the request of a manufacturer. Finally, the pain was too great and I replaced the ISP’s router with my own router. The ISP discouraged this, but all of my issues instantly vanished.

I connected my Netgear router to the Spectrum Modem/router, and did as @buzz suggests. Never had an issue, other than Spectrum dropping more frequently than I preferred. AT&T DSL was way more steady for me. 

Spectrum router caused all the problems with mine. I kept the modem and exchanged the new "latest" router Spectrum gave me with a TP Link 4 and all works now. Fought same thing you were for 2 months. I finally found something in the Sonos site that says Spectrum routers don't work.

Per the support, this will not work for Era 300s

Folks, the easiest fix for any router issues is to plug one of your speakers into the router with an Ethernet cable. Your Sonos system will automatically create its own network and, just like that, all router related issues are solved. Of course, you need to have your router near enough to one of your speakers, or run some cable through your house. But for me, it was a much easier and less expensive fix than having to buy a new router. And yes, you only have to connect one speaker, not all of them. 

BTW, my issues were caused by a new router from Spectrum.

@Airgetlam, can you Bridge the SPECTRUM?

We travel a lot. This Spectrum router incompatibility was just another disappointment. Guess what, Roam doesn't work with hotel wifi. Last year it took 2 calls and 3 hours of Support time to make our SL One speakers work in an Airbnb. Sonos product is just too fragile. Big regret I bought it. It won't play Amazon music, can't "find" the music yet the same music plays via Bluetooth to the Roam. On and on. 

I’ve found it fairly easy to wire several Sonos here, in particular the Arc and Beams since I already had Ethernet to the TVs.

A Sonos Boost is also a good option to get off WiFi IF you don not have any WiFi only Sonos Era speakers.

It is still an aftermarket router.

That’s why I use a Sonos BOOST. It can sit close to the router, without sacrificing a speaker.