Rax120 Reset

I would reset using the rear pin method and setup from new. Don't use a saved config when setting it up.

make notes beforehand of any WiFi names and passwords so when you set it up it's the same as before so your devices all connect.

if it happens again or becomes frequent I would be thinking it's a possible hardware issue but try a reset first. 

I had the same exact issue, been scouring the internet for people with similar issues. I couldn't connect to wifi, opened up nighthawk app and was prompted to do a setup. Was continually having issue of rebooting, but now every time I reboot, it gets factory reset - if I turn off then on, it prompts to setup again (and resets to default name of NETGEARXX). With working remote, I've had to switch back to my old airport extreme for stability currently and trying to mess with the RAX120 when I have time. About to give up on it though, I'm not sure what to do.

Ever since I got the RAX120 in October, the internet speed would be fine for about a day (getting the full 1 gig down), and then it would drop to 20 mbps, and if I restarted, would go back up to gig. That was already completely annoying to begin with (having smarthub, etc hooked up to something you have to reboot once a day), but these new issues are making me re-think the nighthawk router alltogether, it's currently basically useless since every restart results in a factory reset.