I have a centos vps (Parallels Virtuozzo container) which has been running for months. However, a few days ago it started to randomly reboot itself, and i can't find out why. And the biggest problem that i don't understand is that it takes 40 minutes to reboot (as far as i can see in the logs)

root ~ # cat /var/log/messages | grep shutdown
Oct 11 13:52:11 vps27 shutdown[23968]: shutting down for system halt
Oct 14 14:55:17 vps27 shutdown[30662]: shutting down for system halt
Oct 15 06:21:23 vps27 shutdown[20157]: shutting down for system halt

And notice the time difference between shutdown and xinetd's start:

Oct 15 06:21:23 vps27 shutdown[20157]: shutting down for system halt
Oct 15 06:21:24 vps27 init: Switching to runlevel: 0
Oct 15 06:21:27 vps27 saslauthd[30614]: server_exit     : master exited: 30614
Oct 15 06:21:38 vps27 named[30661]: shutting down
Oct 15 06:21:47 vps27 exiting on signal 15
Oct 15 07:04:34 vps27 syslogd 1.4.1: restart.
Oct 15 07:05:06 vps27 xinetd[1471]: xinetd Version 2.3.14 started with libwrap loadavg labeled-networking options compiled in.
Oct 15 07:05:06 vps27 xinetd[1471]: Started working: 0 available services

And here's what Parallels Power Panel says in terms of Status Changes:

Time                       Old Status          Status Obtained
Oct 15, 2011 06:23:46 AM    Mounted                Down
Oct 15, 2011 06:22:31 AM    Running                Mounted
Oct 14, 2011 03:06:48 PM    Starting               Running
Oct 14, 2011 03:06:23 PM    Down                   Starting
Oct 14, 2011 03:06:08 PM    Mounted                Down
Oct 14, 2011 02:58:24 PM    Running                Mounted

For some reason it's getting into Mounting mode and then restarts itself.

The only problem that i can imagine is disk space utilization, which is now 84%. But can that be a reson for system halt?

Time    Category    Details Type    Parameter
Oct 15, 2011 07:08:33 AM    Resource    Resource counter_disk_share_used yellow alert on environment vps27 current value: 82 soft limit: 85 hard limit: 95  Yellow zone counter_disk_share_used
Oct 15, 2011 06:27:23 AM    Resource    Resource counter_disk_share_used yellow alert on environment vps27 current value: 82 soft limit: 85 hard limit: 95  Yellow zone counter_disk_share_used
Oct 15, 2011 06:23:50 AM    Resource    Resource counter_disk_share_used green alert on environment vps27 current value: 0 soft limit: hard limit: 0    Green zone  counter_disk_share_used
Oct 14, 2011 03:06:24 PM    Resource    Resource counter_disk_share_used yellow alert on environment vps27 current value: 83 soft limit: 85 hard limit: 95  Yellow zone counter_disk_share_used
Oct 14, 2011 03:05:50 PM    Resource    Resource counter_disk_share_used green alert on environment vps27 current value: 0 soft limit: hard limit: 0    Green zone  counter_disk_share_used