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Hi,

DUP Acks, and the High delayed response Pings here, are two symptoms to the same problem, which is very high delay on your Internet link, could be a delay on the uplink or the downlink

From the packets here i can guess that it could be a high delay on your uplink, because i can see the FIN packet from cs9.wac.phicdn.net multiple times, which means that your ACK on that packet is not reaching the server or being discarded for being delayed.

if it happens alot, you may want to consider checking with the ISP or changing the home router if it is old.