It could be that whatever web hosting service that PC uses could be having some type of connection issue or slowdown.

I've been having this issue too and I know my computer isn't the problem since I log on here through a custom built gaming computer that I spent over a grand to build which means that it is extremely fast.

If others are having the issue too than it is less probable to be an ISP related issue because the chances of this many people sharing the same ISP is rather low.

My money goes to either the web server (either the web server/service itself or bandwidth issue) or a DNS server somewhere between PC's connection and the internet but that's just me.