Cable tv

Make sure that your cables are connected and tight. Did you try to reboot the box?

@user_8kiao6 

We need more details... First. When these outages occur are they being officially indicated here with any info about them ?;

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 the Xfinity App: https://www.xfinity.com/apps