Outage

First. Check their site for official info on any possible local outages here;

https://www.xfinity.com/support/status 

Use a cell phone internet service, a public WiFi hotspot, or a neighbor's internet if you need to in order to check it.

Or you can use their Xfinity App: https://www.xfinity.com/apps 

user_y2v3ug Good morning! Is this issue isolated to a specific device or all of the devices in the network? 

@user_y2v3ug 

Were you able to find any outage info on that site or in the app ?