I recently had to switch my WRT54G from WPA to WEP security, because a new device only supported WEP. This went fine, except for one XP laptop, which periodically "forgets" the WEP key, and when I check its settings, has the "The key is provided for me automatically" checkbox selected. So I unselect it, enter the key, and everything is fine for a while (minutes to days), and then the connection is broken again. FWIW, the laptop isn't moving, and the signal strength looks OK. Several other devices and laptops do just fine. It's just this one XP service pack 2 machine that has the problem. I have upgraded to what I believe is the latest firmware (1/08). I've seen several references to this problem on the web, but can't find any successful resolutions.