Ok, I've seen the strange AUX 128C bug before. Wouldn't worry about that false reading. Is your CPU an Intel or AMD? If your getting crashes when your NOT underclocking them when a load is placed on them, I would be looking at thermals as the first potential cause. Did you recently assemble this PC, or did this start happening out of nowhere? If you just built it, I'd try removing and reinstalling the CPU cooler. If it's an OEM machine, maybe remove the cooler and install fresh thermal compound. It may be heating up and crashing the computer due to overheating/bad mounting. Also, I would still check your temps using Coretemp if you have an Intel CPU, and look at AMD Overdrive software in the "thermal margin" section. This will...