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I've had to remotely reboot the gateway three times today alone, and 5 times in the last 48 hours. But it seems there is no one available to talk to and the troubleshooting says there is nothing wrong. I have only just upgraded to the xFi and it seems I've completely wasted my money.
Start here;
https://forums.xfinity.com/t5/Your-Home-Network/Internet-Troubleshooting-Tips/m-p/3310447#M316652