Can you enforce the router to use 100mbit/Full Duplex? Also, go to the Device Manager (assuming Windows here because you didn't specify) and right click on the network cards and go to the properties. The settings there should allow you to enable 100mbit Full Duplex.
Let us know if it gets fixed.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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