Same thing here in Tempe! It started about 2-3 weeks ago after and outage. It's messed up my YouTubeTV local channels until I had to reset my home viewing area on every device!!
Cox has no control over the third-party services that are used to try to guess your location. Technically an IP address is not connected to a location at all but in many cases it's possible to guess the location. Unfortunately you'll need to wait for the third-party location services to update their databases. There's nothing you can do to speed up this process.
I lost my access too my SB8200 web interface. It's just not resolving to the web page!! Why would they disable that when I couldn't change anything anyway!
If it's not connecting at all when you go to 192.168.100.1 you're probably affected by a known bug in the latest firmware (AB01.01.009.51_080720_183.0A.NSH) that causes the modem's internal web server to stop working after a period of time, or after several accesses, or when the log exceeds a certain size. You can fix this by power cycling the modem or by using the Reset Modem option in the Cox app.
If it's asking you for a password but you don't know the password, try admin for the user name and the last 8 digits of the modem's serial number for the password. Make sure you're looking at the serial number and not the MAC address or anything else.