3502i keeps losing communication with WLC 5508

Hello all,
This problem only seems to affect one of our sites.  Every once in a while, several APs would lose link to the 5508 and get stranded.  The only way to fix the issue is either to power cycle, or better yet SSH into the APs and use the command "capwap ap controller ip address x.x.x.x", and then they'd automatically rejoin the controller.  At first, I thought network hiccups caused the APs to lose connectivity, but there's none that I could find.  I have the primary/secondary controller IPs configured in them as well.  See log below:
[previous log entries show AP working as intended, then...]
*Jan 18 05:29:29.632: %CAPWAP-3-ERRORLOG: Retransmission count for packet exceeded max(CAPWAP_ECHO_REQUEST
., 1)
*Jan 18 05:29:29.632: %LWAPP-3-CLIENTEVENTLOG: Switching to Standalone mode
*Jan 18 05:29:29.645: %CAPWAP-3-ERRORLOG: GOING BACK TO DISCOVER MODE
*Jan 18 05:29:29.645: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to [ommitted due to security reason]:5246
*Jan 18 05:29:29.704: %WIDS-6-DISABLED: IDS Signature is removed and disabled.
*Jan 18 05:29:32.797: %CLEANAIR-6-STATE: Slot 0 down
*Jan 18 05:29:32.797: %CLEANAIR-6-STATE: Slot 1 down
*Jan 18 05:32:35.214: %CAPWAP-3-DHCP_RENEW: Could not discover WLC using DHCP IP. Renewing DHCP IP.
*Jan 18 05:32:38.278: %LWAPP-3-LWAPP_INTERFACE_GOT_IP_ADDRESS: Interface BVI1 obtained IP from DHCP...
*Jan 18 05:32:38.278: %CAPWAP-3-ERRORLOG: Invalid event 38 & state 2 combination.
*Jan 18 05:32:38.379: %DHCP-6-ADDRESS_ASSIGN: Interface BVI1 assigned DHCP address 10.100.1.20, mask 255.255.255.0, hostname AP020
*Jan 18 05:32:38.379: %LWAPP-3-LWAPP_INTERFACE_GOT_IP_ADDRESS: Interface BVI1 obtained IP from DHCP...
*Jan 18 05:32:46.215: %CAPWAP-3-ERRORLOG: Did not get log server settings from DHCP.
*Jan 18 05:35:41.753: %CAPWAP-3-DHCP_RENEW: Could not discover WLC using DHCP IP. Renewing DHCP IP.
*Jan 18 05:35:44.817: %LWAPP-3-LWAPP_INTERFACE_GOT_IP_ADDRESS: Interface BVI1 obtained IP from DHCP...
*Jan 18 05:35:44.817: %CAPWAP-3-ERRORLOG: Invalid event 38 & state 2 combination.
*Jan 18 05:35:44.898: %DHCP-6-ADDRESS_ASSIGN: Interface BVI1 assigned DHCP address 10.100.1.20, mask 255.255.255.0, hostname AP020
*Jan 18 05:35:44.898: %LWAPP-3-LWAPP_INTERFACE_GOT_IP_ADDRESS: Interface BVI1 obtained IP from DHCP...
*Jan 18 05:35:52.753: %CAPWAP-3-ERRORLOG: Did not get log server settings from DHCP.
*Jan 18 05:38:48.260: %CAPWAP-3-DHCP_RENEW: Could not discover WLC using DHCP IP. Renewing DHCP IP.
*Jan 18 05:38:51.324: %LWAPP-3-LWAPP_INTERFACE_GOT_IP_ADDRESS: Interface BVI1 obtained IP from DHCP...
*Jan 18 05:38:51.324: %CAPWAP-3-ERRORLOG: Invalid event 38 & state 2 combination.
*Jan 18 05:38:51.405: %DHCP-6-ADDRESS_ASSIGN: Interface BVI1 assigned DHCP address 10.100.1.20, mask 255.255.255.0, hostname AP020
[These log messages keep looping endlessly]
These APs discover the controller by using DHCP + DNS.  Any suggestion will be greatly appreciated!
Thanks,
Wil

I have only had this issue a few times but what I end up doing is factory default the AP. I also end up uploading the rcv image and deleting the other images in flash. I do some beta testing so it could be that the images get corrupt, but that has been my fix. The AP joins and then downloads the firmware from the WLC again. It might not be what you want to do, but maybe if its an issue with a particular AP you can test it out.
Sent from Cisco Technical Support iPhone App

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    *Dec  6 15:09:24.063: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up!!!!!!!!!!!
    *Dec  6 15:09:25.139: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up!!!!!!!!!!
    *Dec  6 15:09:26.135: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Premature end of tar file
    ERROR: Problem extracting files from archive.
    Download image failed, notify controller!!! From:7.4.1.37 to 7.4.110.0, FailureCode:3
    archive download: takes 63 seconds
    *Dec  6 15:10:26.851: capwap_image_proc: problem extracting tar file
    ====================================================================================
    after that the AP reboots and do same process over and over again,
    Please help..
    Many Thanks,
    Barth

    Here is the info about AP and WLC:
    (Cisco Controller) >show sysinfo
    Manufacturer's Name.............................. Cisco Systems Inc.
    Product Name..................................... Cisco Controller
    Product Version.................................. 7.4.110.0
    Bootloader Version............................... 1.0.1
    Field Recovery Image Version..................... 6.0.182.0
    Firmware Version................................. FPGA 1.7, Env 1.8, USB console 2.2
    Build Type....................................... DATA + WPS
    System Name...................................... WLC1-AP
    System Location..................................
    System Contact...................................
    System ObjectID.................................. 1.3.6.1.4.1.9.1.1069
    Redundancy Mode.................................. Disabled
    IP Address....................................... 172.16.10.100
    Last Reset....................................... Power on reset
    System Up Time................................... 0 days 4 hrs 12 mins 28 secs
    System Timezone Location.........................
    System Stats Realtime Interval................... 5
    System Stats Normal Interval..................... 180
    Configured Country............................... US  - United States
    Operating Environment............................ Commercial (0 to 40 C)
    --More-- or (q)uit
    Internal Temp Alarm Limits....................... 0 to 65 C
    Internal Temperature............................. +44 C
    External Temperature............................. +28 C
    Fan Status....................................... OK
    State of 802.11b Network......................... Enabled
    State of 802.11a Network......................... Enabled
    Number of WLANs.................................. 1
    Number of Active Clients......................... 0
    Memory Current Usage............................. Unknown
    Memory Average Usage............................. Unknown
    CPU Current Usage................................ Unknown
    CPU Average Usage................................ Unknown
    Burned-in MAC Address............................ F8:72:EA:EF:2E:A0
    Power Supply 1................................... Present, OK
    Power Supply 2................................... Present, Power Off, Fan On
    Maximum number of APs supported.................. 100
    AP4403.a7fd.f040#sh ver
    Cisco IOS Software, C1600 Software (AP1G2-K9W8-M), Version 15.2(2)JB, RELEASE SOFTWARE (fc1)
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2012 by Cisco Systems, Inc.
    Compiled Tue 11-Dec-12 04:45 by prod_rel_team
    ROM: Bootstrap program is C1600 boot loader
    BOOTLDR: C1600 Boot Loader (AP1G2-BOOT-M) LoaderVersion 15.2(2)JAX, RELEASE SOFTWARE (fc1)
    AP4403.a7fd.f040 uptime is 4 minutes
    System returned to ROM by power-on
    System image file is "flash:/ap1g2-k9w8-mx.152-2.JB/ap1g2-k9w8-mx.152-2.JB"
    Last reload reason:
    This product contains cryptographic features and is subject to United
    States and local country laws governing import, export, transfer and
    use. Delivery of Cisco cryptographic products does not imply
    third-party authority to import, export, distribute or use encryption.
    Importers, exporters, distributors and users are responsible for
    compliance with U.S. and local country laws. By using this product you
    agree to comply with applicable laws and regulations. If you are unable
    to comply with U.S. and local laws, return this product immediately.
    A summary of U.S. laws governing Cisco cryptographic products may be found at:
    http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
    If you require further assistance please contact us by sending email to
    [email protected].
    cisco AIR-CAP1602I-C-K9    (PowerPC) processor (revision B0) with 98294K/32768K bytes of memory.
    Processor board ID FGL1711ZJNW
    PowerPC CPU at 533Mhz, revision number 0x2151
    Last reset from power-on
    LWAPP image version 7.4.1.37
    1 Gigabit Ethernet interface
    2 802.11 Radios
    32K bytes of flash-simulated non-volatile configuration memory.
    Base ethernet MAC Address: 44:03:A7:FD:F0:40
    Part Number                          : 73-14671-04
    PCA Assembly Number                  : 000-00000-00
    PCA Revision Number                  :
    PCB Serial Number                    : FOC16517DZ1
    Top Assembly Part Number             : 800-38552-01
    Top Assembly Serial Number           : FGL1711ZJNW
    Top Revision Number                  : A0
    Product/Model Number                 : AIR-CAP1602I-C-K9
    Configuration register is 0xF
    AP4403.a7fd.f040#sh inventory
    NAME: "AP1600", DESCR: "Cisco Aironet 1600 Series (IEEE 802.11n) Access Point"
    PID: AIR-CAP1602I-C-K9 , VID: V01, SN: FGL1711ZJNW

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