Netgear N600 Router Access Not Working

I recently had the power go out in my home and our N600 modem/router seems to have reset to the default settings. The router still works, with more intermitent internet drops than usual. However when I try to access routerlogin.net or the IP address it takes me to a page saying there is no internet service and to activate the equipment with my service provider. I checked with Spectrum and the router is still activated on their end and the internet service is still active as I can use the router just fine most of the time. However, the increased drops of WiFi and being unable to access the router to restore our usual Wifi settings has been frustrating. I have tried a factory reset and the problems still persist.

Any help is greatly appreciated.