Let's start with these reports even though you're not reporting BSOD's: http://www.sevenforums.com/crashes-d...tructions.html
Then, I'd have to check the version of your BIOS (due to the second error).
Here's a link to the eVGA page for your mobo: EVGA Download Center
You can find the latest BIOS versions there. BE VERY, VERY CAREFUL
if you decide to flash your BIOS. You can easily damage your motherboard if you do anything improperly - there is no margin for error here!!! Read the directions fully and print them out for use when doing the actual flash. Do it at a time that there's least likely to be power problems, keep children and small animals away from the system during the flash, and sit on your hands! Even an errant key press at the wrong time has the potential to cause problems!
While waiting for a reply to the uploaded reports, please open the case and point a house fan into it (on high).
If this lessens the frequency of the shutdowns, then you've identified an overheating problem. Let us know the results of using the fan so we can figure out which direction to take this.