It could be a bum DNS or content filtering. Yes, you didn't ask for a solution but I'm going to share what I would try next. The symptoms are consistent with country or ISP meddling.
1. A VPN. Install Opera, turn on its free VPN and see if the problem vanishes. If it does, it's your ISP or a firewall like China has.
2. Bum DNS. Google "How do I change to the Google DNS?" Change that and test.
My internet has been down for 3 weeks straight now. I live in Cairo,Egypt. The problem was with the landline cables which they fixed a week ago. So now on my router it shows that the internet is up and running. And when I go on my router settings through 192.168.1.1 it shows that I am connected. But when I try opening a webpage on my computer it takes me to 126.96.36.199 which does not load because it says it redirects me to many times. Then it tries to redirect me to my ISP's website (Te Data/we) which also doesn't load . When I try it on my phone or tablet it opens a login prompt as if I am in a hotel but doesn't load because of an error in too many redirects. I have obviously contacted my ISP but because they are stupid they have given me no useful info. They just keep saying the same thing that they are working on it without stating the problem. I'm also sure its not a virus because our neighbors have the same problem. I'm not looking for a solution but rather an explanation because my ISP doesn't wanna tell me what's going on!