Is it I Lu an issue with guest users? You can always try to increase the session timeout in the WLAN SSID advanced tab in the wlc. This helps if you are doing any type of webauth or passthrough. Set this for 14400 for 4 hours or 28800 for 8. Really depends on how long you want them to stay connected without being forced to login again. Now if your SSID is open with no authentication that is a different story.