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That router (owned by Verio) just isn't returning ICMP timeouts -- that doesn't mean it is offline. This behavior could be due to the router being overloaded, or it could mean that they are administratively blocking pings for some reason. You would have to talk to your ISP and have them talk to Verio to know for certain.
What matters, though, is whether you get packet loss and spikes to the destination IP -- in other words, your game server. If it does not show problems at the game server hop, then it's not something to really worry about.