Internet Connection abnormalities

In the past, this happened once, and it's come back for the past week.

Symptoms:
- Can't load 2 sites: imgur and xkcd (probably more, I just have come to notice these 2)
- Youtube is UNUSABLE. Other video streaming hosts (pron) work fine, just not Youtube.
Additionals:
- Bandwidth tests:

 local host

 LA host

- Proxies work, leading me to believe that my ISP switched to providing a different IP address, or group of similar ones, I'm not sure.
- I'm using a combination of dynamic IP and Google's DNS.
- I have access to the router's setting (192.168.1.1) to provide extra information if required.
-

 Spoiler

Thanks ahead for any tips to resolve, or bypass this problem.