I usually leave this cheat on 24/7, and I don't even turn it off when I exit, but it's never been an issue for me.
This might sound silly, but what's the cooling fan on your laptop like? My sister's laptop is less than a year old, but the cooling fan died yesterday and now the computer shuts off after being on for less than 10 minutes. It just can't take the heat. Do you use an external cooling fan when you play? I have one on my laptop all the time, but it especially comes in handy when I'm simming because the game's graphics make my laptop run very hot. Just a thought. (Hey, I rhymed!)