Why some APs would register with Secondary WLC while they are configured to Primary WLC

Dears,
I faced strange behavior  i have two WLC one primary and the other one secondary.
some AP join to secondary WLC for short period (2 min or less) and returned to primary, while they are configured to primary WLC.
Two WLC image version: 7.4.121.0
Wait your replies plz.
Thanks,

please find Logs from Secondary WLC. and i can't get Access point logs cause i Remote site.
465    Tue Jun 3 13:20:36 2014    AP '90068-02', MAC: 34:a8:4e:bb:08:90 disassociated previously due to Link Failure. Uptime: 0 days, 18 h 46 m 25 s . Reason: Capwap WTP Event request.
466    Tue Jun 3 13:20:36 2014    AP on the 802.11a radio with Base Radio MAC 34:a8:4e:bb:08:90 (90068-02) is unable to associate. The regulatory domain configured on it '-E' does not match the controller's regulatory domain: -C
493    Tue Jun 3 13:16:59 2014    AP '90068-02', MAC: 34:a8:4e:bb:08:90 disassociated previously due to Link Failure. Uptime: 0 days, 18 h 42 m 55 s . Reason: Capwap WTP Event request.
494    Tue Jun 3 13:16:59 2014    AP on the 802.11a radio with Base Radio MAC 34:a8:4e:bb:08:90 (90068-02) is unable to associate. The regulatory domain configured on it '-E' does not match the controller's regulatory domain: -C
59    Tue Jun 3 13:20:42 2014    AP '90068-01', MAC: 34:a8:4e:bb:06:30 disassociated previously due to Link Failure. Uptime: 0 days, 18 h 47 m 17 s . Reason: Capwap WTP Event request.
460    Tue Jun 3 13:20:42 2014    AP on the 802.11a radio with Base Radio MAC 34:a8:4e:bb:06:30 (90068-01) is unable to associate. The regulatory domain configured on it '-E' does not match the controller's regulatory domain: -C
0    Tue Jun 3 14:51:09 2014    Coverage hole pre alarm for client[1] 94:01:c2:82:26:27 on 802.11b/g interface of AP 54:78:1a:88:2c:c0 (90002-01). Hist: 0 0 1 1 4 8 26 30 22 24 12 21 9 7 3 7 2 2 1 1 0 0 0 0 0 0 0 0 0 0 0
1    Tue Jun 3 14:51:09 2014    Coverage hole pre alarm for client[1] 88:32:9b:5f:e7:91 on 802.11b/g interface of AP 54:78:1a:88:2c:c0 (90002-01). Hist: 1 4 7 15 4 9 4 4 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2    Tue Jun 3 14:51:09 2014    Coverage hole pre alarm for client[1] cc:3a:61:69:d9:4c on 802.11b/g interface of AP 54:78:1a:88:2c:c0 (90002-01). Hist: 0 0 0 0 0 2 13 16 19 13 5 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
3    Tue Jun 3 14:51:09 2014    Coverage hole pre alarm for client[1] bc:44:86:09:f1:ec on 802.11b/g interface of AP 54:78:1a:88:2c:c0 (90002-01). Hist: 0 0 0 3 21 24 13 6 2 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 2 3 0 0
Wait your feedback plz.
Thanks,

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