I have a Linksys router and it does like to be rebooted ever now and then. I just unplug it for about 15 seconds and then it is fine again.
I'm usually the only computer on it so it isn't a matter of spy ware or anything. Most of the routers have a built in ethernet switch that seems to start doing funky things with MAC addressing.
I have found that using a separate hub instead of the built in one seems to cause less problems.
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