Comment 1 for bug 484366

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Colin Harrington (colin-harrington) wrote : Re: network connection randomly drops then restarts

I am also experiencing this issue on Lucid/10.04. My connection drops after ~4 minutes and it prompts me to reconnect. I have lots of other devices (phones, Windows laptop and 2 other Ubuntu 9.10 laptops that all work seamlessly with my wireless network. I also dual-boot the affected machine and it works seamlessly with the same network with OSX.

I can confirm that using wicd made my issue go away.
See http://ubuntuforums.org/showthread.php?t=1485613 for more details about my issue.