My new lenovo U41 keeps freezing all of a sudden?

To clarify i am running Windows 8.1
before it freezes there is no sign of lag.
1) When i was playing the first Five Nights At Freddy's in between night 3 and night 4 it froze
2) While i was restarting the laptop it froze or rather started lagging like crazy
3) When i was plugging in my laptop into a power source it froze again

What should i do. In the 2 days i have had it has frozen at least the 3 times. I really don't want to get it changed with the warranty cuz it would be a pain.
Thanks

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