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Also, I've had the internet at this address for several months, today is the first day this problem has occurred, but its continued from morning to evening intermittently dropping out.
Usually it doesn't even drop out long enough for the computer to realize the internet is gone (just anything that involves internet activity lags and then hangs).
Start here;
https://forums.xfinity.com/t5/Your-Home-Network/Internet-Troubleshooting-Tips/m-p/3310447#M316652