1| Have you tried ruling out that the OS is the culprit by downgrading to a previous known functioning OS like Windows 7 since you're on the Sandy Bridge platform...?
2| When on Windows 10, try reinstalling your OS and disable automatic device driver updates
and manually install all your drivers.
3| As a last resort you can try and install your Intel MEI drivers in compatibility mode:Right click installer>Properties>Compatibility Tab>Windows 7
[from drop down menu]
* If you are on a Z68 Extreme3 Gen3 board:http://www.asrock.com/mb/Intel/Z68%20Extreme3%20Gen3/?cat=Download&os=Win1064
I'm pretty sure the OS is what's causing a havoc with your system for which the last and only hope would be to downgrade to last working OS if the above are a no go.