I have got similar problem, I have found it is caused by the non-root bridge configured to use the wds device.
The "show dot11 ass" command issued on the root shows that the non-root bridge is in "AAA_ReAuth" state. When the non-root bridge gets authenticated, accepts the encryption key, starts exchanging data, and when connects to wds device, it switches its radio off, I do not know the reason. When the root bridge displays the message: "%DOT11-4-MAXRETRIES: Packet to client 0017.0f27.6f30 reached max retries, removing the client" the client stops disconneting.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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