For the most current information see: http://forums.xfinity.com/t5/Customer-Service/SERVICE-INTERRUPTION-6-29-18/m-p/3111403
This thread is locked to keep the conversation in one place.
There's currently a major outage right now which is probably the main reason why your internet doesn't work.
But the OP stated "from 10 AM". The major outage happened later. We can't know for sure unless they return and clarify. He could have possibly meant 10 AM every day ?