Creating a new post not to complicate the IPV6 discussion.
Basically since the move over to IPv6 on Sunday 3rd. Lost internet connection, no IPv4 since 18:00 Sunday. I have disconnected my router and plugged in the HX220 Yayzi router, makes no difference just get a disconnected message in the internet connection. try to connect and nothing NO IP address is provided by DHCP.
I have rebooted ONT and router. nothing.