The WLC version is 4.0.217 with ACS v 4.0. There are certain clients have intermittent wireless, whereby it connects and disconnects and connects again when using dot1x authentication. But they have no problem connecting to SSID with no dot1x authentication and it is very stable. The DOT1X authentication security parameters is PEAP using MSCHAP, OPEN authentication and WEP encryption, no validate certificate, Win2003 AD. There are about 200 users, it is happening for around 10-15 users. Any suggestions or recommendations.