I'm seeing XP SP2 clients (Dell TM 1400 and 1450) lose network connectivity periodically but they stay connected to the AP (running WLC code 4.1.185 on 1131ag). The clients do a "repair connection" and that fixes them, at least until the next episode. No errors on the WLC, client looks fine, good signal, but they can't even ping their gateway when it happens. I saw another posting that indicates it is a client bug and there is a MS patch for it. Anyone know what the patch may be? Other things to check? Using Radius and WPA1 with AES.