Modem allows wired connection but not wireless?

I just recently got a panoramic wifi gateway from Cox and when I initially set it up I had no issues; however, late last night my modem suddenly disappeared from all of my devices and I could not reestablish connection. It wouldn’t even show up as an option on the list of wireless connections. My xbox is connected via ethernet cable and works fine, but nothing else can connect. I’ve already troubleshooted, reset, unplugged and plugged everything back in, and even had an online agent troubleshoot it. Nothing works