ubuntu - disappearing wireless local network - problem in karmic?

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http://www.linuxquestions.org – When I was running Ubuntu hardy my local network would stay up for as long as I kept the desktop machine running. Admittedly that was a different computer although it had the same wireless card. Now under Karmic at some undetermined time the network disappears. Unless I reboot the problem persists. After the reboot the network works fine until it does not. Some of the things I tried are listed below. Following those results are the same results after reboot. output from sudo iwconfig: Code: lo        no wireless extensions. eth0      no wireless exten (HowTos)