I have two XP machines sitting about 3 feet apart. The wireless router is in another room about 25 feet away. Normally, the signal strength on both machines is "Very good", but occasionally one machine or the other (rarely both at the same time) will suddenly show a signal strength drop to "Low" or "Very Low". Box A seems to experience it about 3 times as much as Box B. I have done some testing and it appears that when this happens, my network throughput is about 1-3kbps. It gradually gets slower until network requests simply time out, at which point I have to reboot. Rebooting immediately fixes the problem. I tried to wait it out, thinking it might be interference from a microwave or phone, but the problem never goes away on its own. Also, doing a "repair" on the network connection, or manual disable-enable does not fix the problem. It is extremely puzzling, as it has only been going on for about 4-6 weeks, and seems to be increasing in frequency.