AP无法正常关联到WLC

ackca

哪位大神帮我看看，这是怎么回事，AP一会连上WLC，一会连不上，AP一直报这些
Lost connection to the controller, going to restart CAPWAP...

Restarting CAPWAP State Machine.
Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: Image Data(10).
CAPWAP State: DTLS Teardown
Dropping dtls packet since session is not established. c0a8fec8, 147e, c0a8fe6e, 1490, (nil)
CAPWAP State: Discovery
Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
Discovery Response from 192.168.254.200
Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: Discovery(2).
CAPWAP State: DTLS Setup
CAPWAP State: Join
Sending Join request to 192.168.254.200 through port 5264
Join Response from 192.168.254.200
CAPWAP State: Image Data
do PRECHECK, part1 is active part