I am having this exact same problem, and it migrated across my old computer to my new one. The only thing they have in common is Kaspersky Internet Security 2014/15, VPN software and a CG3000 router, hardware-wise. I have run with Kaspersky off, individually disabled the components, everything except uninstalling it, which is my next step.

I know there's something going on on my ISPs side, but only in the sense that my entire internet connection will go down if I make way too many outbound connections. My ISP by the way is "Yousee.tv".

By the way, if it matters, I, too, experienced these problems at the same server mentioned above. But also on others.