Orbi router doesn't connect

My Orbi RK50 worked fine for ten months. Yesterday I had to reset the Spectrum cable modem for a smart thermostat problem. After rebooting, the Orbi system would not work. The router's top ring just flashed white. After trying multiple times, I reset the router and the satellite. My problem seems to be that the Orbi router is not creating its own network. Bottom line, I go through the procedure via the app. And then when it comes to the satellite, the app says it can't connect with the Spectrum Cable network. Furthermore, on the Spectrum cable modem, the plug does not light up when the Orbi router is connected (like it does with Sonos). I can't log in via the web, I've tried EVERYTHING multiple times. I'll make it even crazier. Very occasionally the Orbi network shows up, but no password works and then it disappears. I'm sophisticated, I've spent 7 hours troubleshooting this to no avail. Any insight would be appreciated. Thank you.