Having an issue with my WLC 5500 and client connectivity. This just started today. Clients will connect for a short period of time and then drop off. WLC appears fine with the exception of a bunch of trap errors. I've rebooted the WLC but this did not clear the issue.
Are there other WLANs in the area that might be interfering? Especially 2.4 spectrum. See if clients have the same issue when connecting with the 5GHz spectrum.
On the WLC CLI you can also run the debug on a specific client to see what is happening, "debug client mac-id"