Internet not working

First,  power-cycle / restart the device by unplugging it for a minute.

@user_y7c0oo Hello! Thanks for asking your question here on Forums, We have a few different ways to restart your modem, including through our Xfinity app or Manually by unplugging the modem, please take a look at this https://www.xfinity.com/support/articles/troubleshooting-your-cable-modem this is how you can restart your gateway. Let me know if this helps 

Sounds familiar.............