- Is someone opening/closing doors affecting the signal path?
- Is something turning on ( for example, a microwave or 2.4 GHz cordless telephone)?
- Do you have a neighbor on the same channel? Look for other APs in your client or use netstumbler -- if you see another AP on the same channel, move it to an unused one: 1, 6 or 11.
- Lastly, and probably most likely, a flakey wireless card on the PC; if all else fails, try a new one/different brand.
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