I'll tell you what this sounds like, it sounds like your Illiad and something else are sharing the same IP address. Basically if the arp table is getting screwed up by the other device (what ever it is).
So try this, note the IP address of your Illiad, turn it off, try to ping that IP address and see if you get a response.
I had a similar problem when I had aliased one of the network adapters on a development machine and didn't notice it because the 'main' IP address was clearly unique!
--Chuck
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