Server Crashed

From the past few days i saw my server being rebooted after every 5-7 days. I thought my dc was doing it as they had done it once before when my server had stopped responding.. After getting fedup with the reboots i emailed them to stop doing so. The responded by saying they did not reboot it in the last week.
I then ran chkrootkit to see any signs of intrusion there were none.. I then ran last . I got the following out put

root pts/5 **.***.***.** Fri Nov 21 23:55 - crash (01:23)

It seems that the server crashed. But how could it. I was logged in at that time.. but was idle. my server is pretty empty andload average's are : 0.00, 0.01, 0.00 at this time and do not go more then 0.5 at any time.

i looked up /var/log/messages for any thing such as crash but found none..

Can any one let me know how to figure out what caused this crash. Was this faulty hard ware .? or was it software.

Thanks in advance

 

 

 

 

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