Ethernet stopped working, Wifi works fine

Wifi is working fine. Issue is the ethernet port stopped transmitting internet through the X1 modem. There is a blinking green light where the ethernet cable is connected. Front of modem is solid white light.

Prior to an outage last Friday, the ethernet worked fine, but now it does not. Other than that, nothing else is different. I believe the light at the port where the ethernet cable was plugged into used to be solid green when working as expected.

I've tried the following:

1. Reset modem through the app. Reset modem by unplugging it, waiting 10 minutes, plugging back in.
2. Trying different ports (there are 4 on the back of this modem, and I can tell the difference between the phone line and ethernet ones, so no, I did not plug into the phone line and expect it to work)
3. The issue is not the devices I used to have ethernet connected to. It is the modem.
4. The issue is not the cables. They are brand new and working as intended. Everything is secure, and I did try unplugging and re-plugging securely into the devices.

Any help is appreciated. I've read conflicting info on this forum about the light colors and what blinking v. solid means. 

Thank you.