IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
Most, perhaps all, modern CPUs have a thermistor, and if you go into your BIOS you can configure shutdowns based on temperature. You probably just crossed the factory set threshold and triggered the shutdown that is in place to protect your hardware. When I overclock Android devices, I always throttle back CPU clock speeds at set temperatures to prevent damage, i.e. at 120 degrees throttle back the CPU to 75% OEM clock speed. Oh, and as the other poster mentioned, laptops aren't really that great on your lap. :-)
Well that is part of your issue, get it off your lap. 1st Thing is to keep the vents free and clear. If those get blocked then you have Thermal probes that kick in that once they kick in it can and will shutdown. I personally run a application that run 100% processor usage, and it sits on its regular feet with no overheating issues.