Hello tpeachey,
It looks like a hardware problem, as the issues are observed during different processing stages. I can send you instructions, how to switch the GPU calculations from CUDA to OpenCL, but if the problem is related to the system, then most likely you'll get a kind of similar errors.
Meanwhile, you can try to run Memtest86 checks, just for case (both in multi- and single-threaded modes), just for case the problem is caused by RAM failures. If CPU, GPU or RAM are overclocked, it may be also a reason of the problem, however, it should be observed during other intensive calculation stages.