Unable to play song ‘song’ - the song is not encoded correctly

Gigabit bandwidth tells us the speed of the internet to your router, but doesn’t say anything about the speed or quality of the connection between your router and your Sonos speakers. 

The first thing I’d do is read the wifi interference FAQ. I’d apply any potential solutions that might be given, to see if they might assist. I’d also give the Sonos devices reserved IP addresses in the router’s system, and see if that also helps the connection stabilize between the speakers and the router. 

Finally, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.

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 phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Sorry you chose to return, rather than to figure out what your issue was. However, all Sonos Ethernet connections are 10/100, and not gigabit speeds. They’re not supposed to be ‘in the middle’ as a network transmission device, and frankly the speed needed for audio is not gigabit by any stretch. Sonos is an endpoint Ethernet device. And certainly the WiFi chips aren’t that fast either. 

Normally, I highly discourage turning off the radio/wifi in the Sonos Arc, wired or not, as it uses that system to connect to both the Sonos Sub and any Surround speakers, using a low latency 5Ghz channel. 

Unfortunately, not being a Sonos employee, I have no access to see those submitted diagnostics, one of the reasons we ask so many questions here in this Community forum, which is why I was encouraging you to contact Sonos Support. 

Since you’ve already chosen your path, most of this data is to help others who stumble in to this thread. But I wish you the best of luck in finding a system that works the way you want it to.