A frequent occurrence, after a software update, is a duplicate IP address issue on the router. Try unplugging all Sonos devices from power, then reboot your router. Wait a couple of minutes, then plug the Sonos back in. 
 

If that resolves the issue, I’d recommend looking at the router’s manual on how to set up reserved IP addresses, and do so for all of your Sonos devices, to avoid this issue going forward. A router that has gotten into this state once can easily do so again. 

That fixed my update and power failure issues.