David's laptop shuts down while he's playing Call of Duty. Leo says that's a protective measure. If the laptop gets too hot, it will shut down by design. The best thing he can do is make sure the laptop has free flowing air all around it so it can cool itself. Make sure that dust isn't blocking the airflow slots. Look to see if the laptop's fans are working properly. It could also be the thermal paste has been misapplied to the processor. It may be worth bringing in to get looked at.