The gear icon is the system light indicating the performance of the router.
When the gear icon turns off, the router may be stuck into freeze.
Reduce number of clients and avoid large file downloading or streaming to check whether the internet connection is stable.
Besides, is the wired connection to the router stable?

Having same issue, it's driving me crazy. Sometimes I doesnt appear as an optin in my WIFI connection list, like if is SSID wasnt working.