Why my laptop starts tearing after 1 or 2 min. when i play fifa 12

[Anubhav007]

when i start my fifa 12 and starts playing some match my laptop starts tearing and sleep after 1 or 2 minuets even i have upgraded my 1 gb ram to 3 gab ram

 

[13thmonkey]

heat, check temps of CPU and GPU. My theory is that the GPU/CPU is overheating and throttling therefore slowing down, try turning V sync on, might help a bit, but check the temps. Need specs too.