Run your diagnostic tool and make sure your fans and thermometers are running correctly, you seem to be shutting down because of overheating more than you should.
Also what laptop is it? You could try to lower your voltage usage for your CPU, (is very safe to do) and can lower some heat.
You could also lift your laptop with water bottle caps also, but do get that chill mat. Get also a dust buster, dust is a laptop killer.
And the obvious silly answer but does wonders in hot countries:
http://files0.sharedreviews.net/imag...1243213715.jpg
Blast that bastard directly to your laptop and laugh at your heat problems
