check ur server and see the logs ,, i think u have a rootkit in the server ,, may it will be the SuckIt rootkit ,, it make a conflict with kernel and the server will shutdown alone ,,
,, do not try the ps x coz this rootkit will be hide
second may u have a conflict in server hardware ,, ask the Co and they will tell u
third may onwz u and try the kernel exploit for rebooting the box ,,
u will get the answer by the log ,, see if any one has access on server
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