These are probably off-net cache servers for Google, which means that to save money on transit costs, Time Warner has installed special servers and Youtube refe

These are probably off-net cache servers for Google, which means that to save money on transit costs, Time Warner has installed special servers and Youtube references them directly for Comcast subscribers (lot's of things give this away, but I wouldn't be surprised if it was DNS based and they know based upon your resolver. Try switching over to a global but not eDNS based resolver and see what happens). If that is the case, it's not unlikely that the off-net boxes are simply overloaded for people in this guy's usage area.