Sounds like you're already on the right track, I'd check for updated drivers, and I'd also reposition the PC to give the WiFi antenna a clearer field, make sure that the other cables for the computer (especially the power cords) are as far away as possible.
With a Linksys card most likely you're just picking up some interference from an unknown source (remember those little FCC disclaimers on EVERYTHING?) and repositioning the antenna is your best bet. Failing that you could just have a gimpy wireless card, but with an intermittent problem like this that would be almost impossible to verify.
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Halfway to hell and picking up speed.
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