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For years been looking up answers why my SL one left surround sound keeps disconnecting. Did all the troubling shooting, unplug, reset, move the speakers closer, get a WiFi boosters. I may figured out a partial solution. I haven’t added the Apple Music account and haven’t lost the speaker since. So reboot the system and don’t add the Apple Music. 

Not sure I understand this, but if it works for you….

Generally speaking, surround speakers connect to a ‘hidden’ 5Ghz signal emitted by the Sonos soundbar. While this signal can’t be seen in your controller, or in your router’s reports, it is susceptible wifi interference. They don’t, once set up, connect directly to your WiFi signal, no matter how many ‘boosters’ you use. 

It’s always a good idea to reboot a system, including a router. Electronics can get hit by various issues that can get cleared by reloading the OS, which happens when you unplug the device. 

I’m a tad confused about your ‘workaround’. 


As ​@Airgetlam said your work around is not logical to resolve an issue with your surround speaker. There’s something going on with the hidden 5 GHz signal mentioned and/or the speaker has a failing network card.

There have been issues mentioned when streaming Apple Music lossless. Could you have been streaming Apple Music with the surrounds set to full for music when the assumed discount occurred?