Since its a laptop with Vista:
Check your power settings in the control panel. You may have a laptop mode enabled which turns off inactive or perceived inactive USB ports to save power.
BUT, that does not explain why your other mice dont have the issue.
I'm not familiar with the Naga even though I like Razer mice. Do you have their special software installed? Is there a setting somewhere in the Razer software that tells the mouse to go into low power mode after a few minutes?
Its possible that if the mouse is not drawing enough power its making Windows think the USB port is inactive and its cutting off the power completely.
Of course, I'm just guessing here. I have a Razer Diamondback with Windows 7 but I didnt install the Razer software. In Win 7 its under the Advanced Power Options and its called USB Selective Suspend.
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Last edited by shortylickens; 02-19-2010 at 07:51 AM.