No wifi on my Netgear Wireless-N 300M

I have an N300 (wireless-n) that worked perfectly for 1yr and then started disconnecting. After several weeks of rebooting the router on a daily basis (after which it would work fine) and updating the router's firmware, I am no longer receiving any wifi signal from the router on any devices. The router works fine, and all of my devices work fine when plugged directly into the modem via ethernet cable.

I've tried connecting my computer to the router via ethernet cable to enter the router settings but it does not have a proper gateway.. Instead it's only copying the gateway of the initial modem and acting like a repeater without wifi... It works fine only when connecting to it via ethernet....

Any suggestions?