There is some evidence that this error is linked to Microsoft updates. You could uninstall the August updates one at a time to find the culprit.

Firstly, you should stop the rebooting so that the STOP error can be seen on the screen. Right-click My Computer, Properties, Advanced Tab, StartUp and Recovery at the bottom, Settings and untick 'Auto Restart'. Next time the error occurs make a note of the number (format 0x0000000A) and look it up here http://www.aumha.org/a/stop.php

After making a note of the error hold in the power button to turn off the computer.