I have 3 Sonos products - Play 1, Move and Arc. My wifi speed is 300+mbps, with Linksys mesh system.
When I launch the Sonos app on my iPhone it’s a lottery as to whether I get the “Unable to connect ...” or if I’m lucky, any permutation of one, two or all three of the above units. I then waste time rebooting my router and switching off and on the respective units with varying degrees of success until eventually it works.
I’ve spent hours reading many topics here on this subject and like many other users I’m increasingly frustrated by having paid a small fortune for these units, (which are great when they work properly) the connectivity is very unreliable. My wifi doesn’t have any problem in connecting with any of the several other wireless devices in my house so to my albeit technically simple mind this must be a Sonos problem. Is there any proven solution and if not, why not since it’s been an issue for several years?