Wow, I just got off the phone with SONOS support. First time I have called in 12 years. I long for the days when you called and got an engineer on the phone. Someone who does not read from a script and actually understands the technology including networking. The issue was my environment was disappearing. This was happening on MAC, IPADs, PC and Iphones. It would either connect, take minutes to connect or just tell me in could not find the SONOS network. I rebooted the Unifi 24 Port Pro and UDM Pro without much luck. I was able to connect to the devices via web interface and they were all there. All on the correct network however once I got connected via the app I removed the network and added it back. I also use SONOSnet on some as I have them wired in.. I changed channels and finally settled on “1”.
Support kept asking to remote into the iphone to check it’s settings. Just didn’t get it was not the Iphone. Also, he did not understand what a UDM Pro was - He kept asking for the router model which is a UDM Pro. That seemed to confuse him because he was stuck in a loop “What is the model”. He put me on hold for five minutes and came back insisting it was an unsupported router. When I asked for a level 2 or 3 he was going to pass me to a supervisor . Sigh - I have been doing this for 15+ years. I remember talking to John MacFarlane - asking to be a beta tester and boom it was done. SONOS is fantastic - I sell it to everyone I can - But the support is terrible.