My other laptop started turning itself off, and was very hot when it did it. After I thought about it for a while, I had my son get out the vacuum cleaner and completely suck out every last speck of dust we could get from the vents and the fan area. Then, I made sure I used the laptop propped up, so that the bottom was not sitting flat, blocking the vents and fan. No more problem with shutting down and overheating. You would be amazed at the amount of dirt these things can suck up. DO NOT USE CANNED AIR. It just forces the dirt further in. I was just noticing I really need to vacuuum the keyboard of this one, lol.
Btw, I still use both laptops.