Lenovo G550 2958H2Q turns off suddenly while working

Hi i am using Lenovo G550 2958h2q and its 11 months old. Its been just two days my laptop suddenly turns off while working particularly when I am using the internet and more particularly when I am opening many tabs in my browser and streaming videos through internet or running multiple applications. I have a 512MB NVIDIA graphics card installed.
Thanks in advance.

when did you perform windows installation last time?
or un-install graphic cards, restart your computer and install it again. if it doesn't work, i suggest you to perform clean windows installation.

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