WM:0 indicates they’re running on SonosNet. Make sure that’s using channel 1, 6 or 11, and if so try changing to one of the other of those three channels. Also ensure your mesh network is locked to one other of those three channels - not the same as you use for SonosNet. 

With that great Wi-Fi setup why are you using Sonosnet? 

I'd sure try putting everything on your Wi-Fi by unplugging the Ethernet. 

Thanks nik9669a and Stanley_4 for your reply.

1. Not sure how to change the wifi channels for Sonos - I dont see anything in the web interface. Not so sure that that would be a great idea since I am in New York City. Lots of wifi congestion. Think it is probably better for everything to find the least congested channels???
2. Thought that ethernet would be more reliable. So you are saying if wifi is strong it is a better option?

Looking around in the web interface I found this chart. Not sure how to interpret it but it looks like some things may not be optimal.

If you want them to remain connected via Ethernet turn off their WoFi radios.

Wi-Fi channel changing is in the Apps only not the web controller page.

The problem  with running Sonosnet is that you have to find a good channel to run it on in addition to what your wifi is on. Only 3 clear channels and congestion from neighbors isn't going to help.

Ethernet is better BUT it comes with constraints, I did a lot of reading here before deciding to go Wi-Fi only here. Even the signal strength info available is more useful than that old chart that doesn't fully support new Sonos.

Mopac's suggestion is good but it can impact Sub surround operation.

Go with simplicity first, go more complicated only if needed.

Yes… if you have a soundbar you need to leave the radio on.  The sub(s) & surround use the soundbar’s radio.

Thanks everyone. I Am going to be away until early January -will test and post back when I return.

Hope everyone ha a nice holiday