Static IP no connection, no log activity

I e had a problem all morning. All ok at ONT level but no internet connection. When I went in to router it had reset to dynamic IP and was getting repeat DHCP unavailable errors. Switched it back to static IP and now it’s not working but there is no log activity beyond an initial send OFFER…Diagnostics shows WAN connected but fails at NCSI and says to configure DNS (have it set to 8.8.8.8).

Any thoughts?

Are you using the Yayzi router? Is the VLAN set to 911?