The heat is a well-known issue; these machines are not really engineered very well.
All modern laptops are heat sensitive. Even though they are called "Laptops", that is probably the worst place you can have it while it's running. If you use it at a desk, purchase or make something that props it up a bit so that there is more airflow underneath. Try and stay mindfull of the hot spots if you are using it in your lap and try and prop it up so those spots get some air.
I have a metal laptop stand that is basically just an angled metal tray with a lot of holes in it that raises it up off of the desk. Simple, attractive and effective.
-MikeM