Netgear D7000v2

After I lose power on My Nighthawk D7000v2 e.g. a minor power cut, or If i unplug it from the mains, l always lose the internet. The router reboots and looks normal  but there is no internet connection. It's not automatically reconnecting. It only does so, when I go into the router and into the advanced tab and select internet setup and click on apply. Only after doing so, then the internet connection comes up. It is set to auto detect. I'am using this as a fibre router and not copper broadband settings.

Any Help appreciated