Why is my Internet constantly going down?

The concern is not "Home Security Devices And Equipment" help related........... Topic moved here to the proper help section for assistance. 

First. When these outages occur, are they being officially indicated with any info about them 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