That’s a fairly good indication that the controller app isn’t able to reach the speakers, for some reason, in order to load all the information to show you.
This could be for any of many, many reasons. The speakers could be powered down. The controller app and the speakers could be on different subnets, or even different networks. There could be a VPN or work profile blocking the controller app from accessing local devices. The router may need to be rebooted. Or any of several issues covered in the wifi interference FAQ.
I would recommend that you call Sonos Support directly to discuss it.
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 network and Sonos system.
That makes sense. Thank you Bruce, will do