The G-3 gateway acts as both a WiFi Client AND a WiFi Access Point (also known as AP or Master). If its configured with a client connection to a SSID that is not visible or has changed it will no longer show up as a WiFi AP. Put another way, if it can't connect to its client connection you wont be able to connect to it on WiFi. To solve this use the wired ethernet cable connection to access the gateway and delete the wifi client connection or hold down the reset button for at least 10 seconds until all the LEDs but power go off and then on again to reset the gateway to factory defaults.
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