What Sonos products? Have you tried wiring a Sonos device directly to your router with an Ethernet cable, waiting a minute, then opening your controller? Have you called Sonos Support directly to discuss it?

Sounds like you might be on the S1 app?

I don’t know about the update solution, seen it discussed but not paid a lot of attention as I’m not on S1. A forum serch might help you out.

The WiFi may be an interference issue, I’d start here:

https://support.sonos.com/en-us/article/improve-your-sonos-products-wifi-connection