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I had, what souds like the same problem with my connection after I added a wireless router. My desktop connection (wired) would randomly stop working after being on for a while.
Turned out that zonealarm was causing some kind of problem. When my connection would crap out, I could shut down zonealarm and it would start working again without a reboot. I have no idea how it caused the problem but when I ditched zonealarm it went away completly.
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