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When it first started happening I would sometimes get a BSoD.
This indicates hardware/driver problems.
First thing to do is make sure heat isn't the issue. GoPro and DSLR video is CPU-intensive to decode, and if you're re-encoding to H.264 that adds to the CPU usage. If you're using Hardware MPE and the GPU is being stressed, that's a potential source of trouble. Make sure all fans are operating and no dust exists inside the case. Then try troubleshooting your RAM. Pull out 2 chips and try rendering again. If it fails, swap the RAM chips.
Holy crap I'm an idiot. And I call myself a tech guy. Your mentioning that those codecs are CPU intensive got me digging in the computer (which I was hesitant to do because I have to dissasemble my desk to get to it). Long story short, I've got a BIG dog in the house. She sheds twice her bodyweight a day in fur and skin. My computer uses a closed-loop liquid coolant system, so unlike a normal CPU fan that you can hear suffering, it cries quietly. Come to find the radiator was completely jamed with dust. The dust here seems to be worse than it was in Iraq, the country that could kill any CD drive in two DVDs flat.
SO glad it wasn't a bad component, just a stupid owner. Thanks for your help!