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DC rebooted twice in 12 hours with no apparent reason

Last Modified: 2012-08-22
I've got a 2008 R2 DC that rebooted twice in almost exactly twelve hours apart.  It did this morning at 4:02 am and today a 4:08 pm.  Don't really see anything in the logs.  Just a lot of warnings.  See below.  However those aren't new.  I've never been able to solve it.

The only other error is a disk error, but that is caused by the external disks I have attached to a USB hub.  This also is not a new error.

The driver detected a controller error on \Device\Harddisk3\DR3.

Any ideas on where to start looking?

Windows could not record  the Resultant Set of Policy (RSoP) information for the Group Policy extension <Security>. Group Policy settings successfully applied to the computer or user; however, management tools may not report accurately.
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