Nice specs, btw. Never knew what your computer was like
How much RAM do you have? I've been away from the hardware scene for quite some time, so I can't really think well enough, but I remember that a PC I had had run into some RAM problems. Everything was working fine, but then started to crash and stuff. Doubled the RAM and everything went back to normal.
And even though it doesn't seem like a GPU problem, don't forget to upgrade the drivers
