Hi,
Many reasons could caused the computer shutdown expectedly.
Was this behavior regular?
Please check if there any schedule task is configured to carry out this operation.
Run this command:
schtasks /query /v /fo LIST
If there is no clue, perform a Clean Boot to see if there is any third-party software conflicts.
How to perform a clean boot in Windows
http://support.microsoft.com/kb/929135
Karen Hu
TechNet Community Support
