Often get this message on my iphone while listening to music! This happens when network is working fine, wifi is good on phone and other devices, etx - nothing changed, then, “unable to connect.” And I can't stop the music or adjust volume. Fix is to reboot everything over and over. System is Play:1
"unable to connect to Sonos"
Best answer by Airgetlam
I’d certainly read the wifi interference FAQ, as very frequently, that’s the cause of this issue. Unclear from your post whether the issue is between your router and the iPhone, or your speakers and the router. It might help you find out if you were to 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 Sonos system and network.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
