Does this occur randomly or can you replicate an incident. I have similar problems, randomly, but in my case it frequently goes off to BSOD, but this then closes the PC down before I can catch the error code. Mine is also a self build PC (Windows 7) and I'm planning a rebuild when I can get round to it, but meanwhile I've learned to live with the problem as it occurs quite infrequently - about one every other month. Certainly, in your case it appears that you are not crashing out, so your work-around might be to reboot your PC immediately and possibly reboot into safe mode first.
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