Hello! I have an SB8200 Surfboard modem that seems to be non functional. I can connect to my wifi but I can't connect to the internet.

The light are (top to bottom) Yellow, Blue, Yellow, Yellow, and the rest are off

I'm pretty sure my warranty is still active but when I checked online it says it can't find the device. I've double and triple checked the serial number and it's exactly what it says on the modem. Every number. I'd even show the picture if It was safe to share the serial number but I'm not sure. I've tried adding spaces between the letters, I've tried using every other code on the modem even if it isn't labeled as the serial number, I've tried adding S/M: the the beginning of the number, I've tried adding zeros, removing numbers, putting letters in upper or lowercase, nothing has worked. This is the main reason I made this post