F5 8400 Reload randomly

I have strange problem with our F5 8400 BigIP. We have two bigip 8400 working as active and standby in one of our DSP. Version is 10.2.0.1789

Now the strange problem with our primary one is that it reload randomly at any time.

Below is the "last" command from the problematic F5 BIGIP

wtmp begins Wed Dec 1 12:55:57 2010

[root@SAJDH1LDB01:Standby] config last

root pts/0 192.168.99.81 Mon Dec 20 14:40 still logged in

root pts/0 192.168.99.78 Mon Dec 20 14:21 - 14:35 (00:14)

root pts/0 192.168.99.78 Mon Dec 20 13:50 - 14:08 (00:18)

reboot system boot 2.6.18-164.11.1. Mon Dec 20 06:39 (08:05)

reboot system boot 2.6.18-164.11.1. Wed Dec 15 18:27 (4+20:18)

root pts/0 192.168.99.84 Mon Dec 13 17:03 - 17:03 (00:00)

reboot system boot 2.6.18-164.11.1. Mon Dec 6 19:07 (13+19:38)

reboot system boot 2.6.18-164.11.1. Mon Dec 6 15:01 (13+23:44)

reboot system boot 2.6.18-164.11.1. Wed Dec 1 12:55 (19+01:50)

Below is the "last" command from the F5 which is working fine

[root@SAJDH1LDB02:Active] config last

root pts/0 192.168.99.81 Mon Dec 20 14:45 still logged in

root pts/0 192.168.99.78 Mon Dec 20 13:51 - 14:09 (00:17)

My issue is not related to the logrotate

I think my issue is related to kernel 2.6.18-164.11.1 issue.

Any help in this regards would be helpful