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[ubuntu] Lose network connection intermittently

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http://ubuntuforums.org – Howdy, I've got a problem I can't solve. At work I am migrating my old workstation to the new and running ubuntu 12.04 (on both). Everything is going fine except ... if I let the new machine sit for a while, I lose internet access. This is especially troubling when I leave for the night, try to login at home, and can't connect. Possibly it occurs when the screen goes to sleep, but I'm not sure about that. It occurs during the day as well. How does one fix it? sudo service network-manager restart doesn't seem to work. But if I pull out the ethernet cord and immediately plug it back in, withi (Hardware)