Spectrum problem

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

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.

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 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!

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.

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

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.

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. 

@Airgetlam, can you Bridge the SPECTRUM?

I think it depends on which one you get. The version I had, 4 years ago, yes. I’m not sure that version is still available, but I haven’t checked, I’m happy not to have to deal with Spectrum any longer. That being said, I’m really hoping fiber gets to my location in the next several years, right now CenturyLink is the only wired possibility, and they failed four attempts to install over three months, I have too many trees to go with a satellite option, so I’m stuck with a 5G offering from a cellular company. Living in the sticks does have some connectivity restrictions.