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Just had another thought ... did you use shielded CAT5 cable for the 100' run? If you are running the machinery that you mentioned, there is a possibility that interference is acting on the line. Does the 100' run move within magnetic range of the machinery?
There's also the option of Gigabit ethernet that runs on the same cat5 cable. So, if you're up to changing out some PCI cards and router, that might be an option for you.
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