These are a few of the problems associated with this scenario:
This problem is documented in Cisco bug ID CSCeb52431.
This issue is fixed in Cisco IOS 12.3(7)JA and subsequent releases.
Refer to the Configuring the Authentication Cache and Profile section of Administering the Access Point for more details on how to configure this feature.
Refer to Field Notice: IOS Access Point Bombards TACACS+ Server with Requests for a workaround.
Refer to Downloads for Cisco IOS version 12.3(7)JA.
LEAP / RADIUS
Wireless client to AP