If you have access to a linux box, try pulling a sniffer on it, looking for dropped packets or mismatches. Bad ethernet card/driver possiblity.
I noticed some wierd stuff talking to the empeg over a transparent firewall bridge (don't ask... I just needed an ip addressable machine to play with, and guess what happened to be around.) Turned out to have a marginal ethernet card in the bridge, giving the errors. Doing a TCPDUMP on the connection was pretty interesting..
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Synergy
[orange]mk2, 42G: [blue] mk2a, 10G[/blue][/green]
I tried Patience, but it took too long.