Just a thought on this, is WPA AES enabeld on the SSID? If so try disabling it if you can. I have run into several instances where when that was enabled even though not being used it caused thousands of re-authentications per second. I actually saw it take down 2 seperate client facilities, in both cases I had TAC Cases open and TAC couldn't understand why it was happening, only that once we disabled WPA AES it immediately stopped and the clients only re-authed on the timer set in the WLC for Session timeout.
for starters, do a client debug and see what is going on ...
from the WLC
debug client XXXXXXXXXX
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