I have 3 Sonos One, 1 Sonos Aura 300 and 1 Port.
Last week, all were visible on my iPhone App (iOS 17.5) and Network and were usable. Now 2 of the One’s are visible and work and the Aura too. The other devices are now longer visible as part of my system. They have not been disconnected by me.
Tried reconnecting them. My phone finds them, tries to connects, which it says it has, but the connecting to WIFI part fails, although router and WIFI code haven’t changed.

What is going on? WIFI is WPA2 and broadcasting both 2,4 and 5 GHZ. All other 60+ devices I have are connected to WIFI with no issues.