Yeah it's hard to say - I'd try messing around with your network configuration. Try forwarding the P99 ports (world server: 9000 zones: 7000-7150), try switching to a static IP instead of using DHCP, try using Google's public DNS address instead of obtaining one automatically if you aren't.
Could also be a bad network card at that point - integrated or otherwise. Might want to disable your ethernet connection and try a USB wireless stick or a different network card to rule that out.
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