If you’re encountering connection issues between your Sonos mobile controller App and your Sonos devices, my own thoughts here are that anyone with the type of issue ‘perhaps’ could have a multicast ‘device discovery’ issue across their local network that’s preventing the controller device from communicating with their Sonos speakers. See attached re: SSDP/mDNS.

Such communication failure can occur across networks that use WiFi extenders, EoP adapters, or if managed switches are misconfigured. It can also happen if some settings on a local router are incorrect, or there’s software running on the mobile device that is getting in the way of the multicast communication, such as security software, VPN client, firewall, site blockers etc.

I’d perhaps investigate further in the areas mentioned and if still no luck, then it maybe best to reproduce the issue(s) seen and then immediately submit a Sonos system diagnostic report from within the Sonos App, note it’s reference and contact/chat with Sonos Support Staff via this LINK and see what the Staff can perhaps suggest to help you to resolve the matter.

I’ve done all I can think of myself to eradicate multicast issues and my controller and the system seems to be working okay - I’ve attached a short recording from my iPhone XR, it at least shows the Sonos App can and does work okay if any network issues are resolved - so definitely give Sonos a call, if you can’t resolve things.

For some reason, I just can’t see them popping around to your place.

Happy Holidays

Sorry but I am dealing with probability same connection issues. Can't connect. App keeps saying something went wrong. Reboot my router and if lucky it will reconnect for about 2-3 songs then something went wrong again. Even to suggest trying to figure out all of the suggested issues with MY router is unreasonable. How many people have that technical knowledge? My other wireless devices in the house connect consistently and as promised. Sonos needs to make their software better. 

I certainly don’t disagree, but just to say if you can’t resolve such issues yourself, and if you’ve not tried it already, it may still be worth speaking to Sonos Customer Support, as they maybe able to pinpoint and resolve any issues with you.

Why wait, if their Staff maybe able to resolve things for you sooner, rather than later?