[ubuntu] USB wireless keyboard/mouse stops working

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http://ubuntuforums.org – This happens every few hours. I am running fine and then the keyboard and mouse completely stop working - though the system seems to be still running. I've tried two different wireless keyboard/mouse sets (different models) and the same thing happens. I am running 9.04 on a Dell 9100 in dual boot with XP. This problem does not seem to occur in the XP os. Thanks (Hardware)