I have to keep turning off and on to establish connection
See if this helps:
Thanks for posting to the Xfinity Forums. I apologize for the experience you're having. After checking out the link provided by @RobertWy, are you still having issues with your modem? If so, I'd like to help troubleshoot. Please send me a private message by clicking on my name, "ComcastChe" then click send a message. In the body of this message please verify your first and last name.