Internet not working g properly

First. Please try starting here if you wish;

https://forums.xfinity.com/conversations/your-home-network/connection-troubleshooting-tips/602da777c5375f08cdea3db9 

Hello @user_1iuv0j, Thanks so much for taking a moment out of your day to leave a post on our community forum, and we would be happy to help. Are you still having connection issues with your internet service?