I have the exact same issue there are no splitters in my line it goes straight from the pole into my modem. I can see in my modem logs the problem is xfinity's network, and they always blame my modem and tell me to follow the troubleshooting guide. It's been like this almost daily since at least march. Sometimes it goes out for 2 mins other times like today its 12 plus hours. I don't even bother trying to make new threads because the mods here can only kiss up to xfinity mark your post as answered, pat themselves on the back and move on to repeat the process, and they delete my replies. If I had any other options for high speed internet I would drop them 3 months ago.