I have recently gotten a new laptop from a firm building their own computers.
The problem I have had with this computer is that it randomly shuts itself down. It is not when it is under heavy use or anything like that and it does it both on my Win 8 partition, but also when I run a Linux (Mint) from an external USB drive.
I do not get any error screens and it is more like the computer shuting down like I pressed the "Shut down" button.
When I check the error-log I just get a Kernel-Power error saying "The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly." and just before "An I/O operation initiated by the Registry failed unrecoverably.The Registry could not flush hive (file): ''.
It is not regular, but when it does it, it does it again when I turn it on once again.