Laptop auto-shutdown problem when gaming

hi,

i have a acer aspire 4736zg 422G32M.


When i play games for about 30~45 minutes or so the computer automatically shuts down by itself without any blue screen are anything....before it doesnt...i use windows 7 ultimate

Please help.

Thanks!



I didn't find the right solution from the Internet.



References:
 www.tomsguide.com/forum/58478-35-laptop-auto-shutdown-problem-gaming



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