WLC 5508 - wlan stability problems

Hi.
I have a WLC 5508 with half a dozen LAPs (AIR-CAP3502I-E-K9).
They have been working but sometimes clients detect conectivity problems with the wlan.
Here is the message log I can obtain from the controller:
Nov 09 12:16:31.886: [ERROR] pemTimers.c 330: invalid interface name (john_doe) in mscb!!!*dot1xMsgTask: Nov 09 12:16:10.286: %DOT1X-3-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:444 Max EAPOL-key M1 retransmissions exceeded for client 00:26:c6:12:e8:32Previous message occurred 7 times.Nov 09 11:55:24.682: [ERROR] pemTimers.c 330: invalid interface name (john_doe) in mscb!!!*apfReceiveTask: Nov 09 11:51:30.788: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg *spamApTask2: Nov 09 11:51:20.144: %DTLS-3-HANDSHAKE_FAILURE: openssl_dtls.c:631 Failed to complete DTLS handshake with peer 10.23.1.118*dot1xMsgTask: Nov 09 11:50:44.878: %DOT1X-3-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:444 Max EAPOL-key M1 retransmissions exceeded for client e0:ca:94:93:be:67*apfReceiveTask: Nov 09 11:50:40.672: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg *apfReceiveTask: Nov 09 11:50:38.625: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg *apfReceiveTask: Nov 09 11:50:35.531: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg *apfReceiveTask: Nov 09 11:50:31.068: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg *apfReceiveTask: Nov 09 11:50:29.257: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg *apfReceiveTask: Nov 09 11:50:28.707: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg *apfReceiveTask: Nov 09 11:50:24.065: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
Can somebody help me to understand these messages?
1)
*apfReceiveTask: Nov 09 11:50:24.065: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
2)
Nov 09 11:55:24.682: [ERROR] pemTimers.c 330: invalid interface name (john_doe) in mscb!!!
3)
*dot1xMsgTask: Nov 09 11:50:44.878: %DOT1X-3-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:444 Max EAPOL-key M1 retransmissions exceeded for client e0:ca:94:93:be:67
Thanks

1)
*apfReceiveTask: Nov 09 11:50:24.065: %RRM-3-RRM_LOGMSG: rrmChanUtils.c:290 RRM LOG: Airewave Director: Could not find valid channel lists for 802.11bg
//APs are rebooting. don't panic, check the up time of AP. This message seen when AP rebooted/freshly joined and waiting for wlc to assign channel.
2)
Nov 09 11:55:24.682: [ERROR] pemTimers.c 330: invalid interface name (john_doe) in mscb!!!
//It is cosmetic and can be ignored.
3)
*dot1xMsgTask: Nov 09 12:16:10.286: %DOT1X-3-MAX_EAPOL_KEY_RETRANS: 1x_ptsm.c:444 Max EAPOL-key M1 retransmissions exceeded for client 00:26:c6:12:e8:32
//Keys M1-M5 used for wireless auth, here client having struggle completing the auth process.
get output of, WLC>debug client

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Hallöchen kennt sich jemand mit den Dingern tiefgründiger aus? Ich hätte da mal ein frage bzgl. der interface Groups.
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I already go to this link to check the Description of errors-
http://www.cisco.com/en/US/docs/wireless/controller/message/guide/msgs4.html#wp1000139
Appreciate all feedback. Thank you.

Hi Ruben,
a) After successful dot1x authentication, session keys are derived from pairwise master key.
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http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/7-5/High_Availability_DG.html#pgfId-74573
that's a good guide just to double check yourself just in case. -

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