no sounds from paired Symfonisk Lamp (Gen 2) Surround after upgrading to Arc Ultra

Hi @liangyu 

Welcome to the Sonos Community!

Sorry to hear of this issue you are having with your surround speakers since upgrading to an Arc Ultra.

On the diagnostics you submitted on the 2nd Nov, I can see that the surrounds are reporting that they are connecting to WiFi rather than to a signal coming from the Arc Ultra, as they should. This is the cause of the problem you see.

Please remove the surround speakers from the Arc Ultra, then add them back on again:

1. Settings icon » [room with Arc Ultra] » Remove Surrounds. Follow the prompts, and opt to put the surrounds into temporary rooms.
2. Settings icon » [room with Arc Ultra] » Set up Surrounds.

Please also ensure that there are no sources of interference near the Arc Ultra or your surrounds. Please see our Reducing wireless interference help page for details.

If the issue persists, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.

I hope this helps.

thanks for the reply. 
 

I’ve tried to reset all devices and remove surrounds and adding it back but still failed. The only way to fix the surrounds sound issue is to connect Ethernet cable with the Arc Ultra. 
 

previously my Beam Gen 2 do not have such issue and work flawlessly with my surrounds via WiFi. 

This is the only way I have ever had my soundbars setup, and has work flawlessly for all the years I have been using Sonos in my home. It has worked well even through the introduction of the new app. I only had minor annoyances, like the volume issue that was fix with a network reboot.

While Sonos is marketed as a wireless audio solution, not all wireless networks are created the same. Neither are all Sonos speakers. For some, using an ethernet cable is a deal breaker, for me it's an assurance that WIFI interference wont stop the music.