I had a similiar/same problem. It could happen ever 5 minutes or every 4 hours; completely void of any pattern. What it turned out to be was my fan for some reason. I took off the case fan (disconnected it from the motherboard, actually) and it has never restarted since. Try just having your motherboard, processor, video card and processor heatsink/fan installed and see if it restarts. Add components one by one and try eliminating potential sources like that.
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