It may just be over heating. Turn the laptop off. Locate the fan on the bottom, then locate the exhaust. Put your mouth up to the exhaust and blow (like a harmonica). If you get some dust expelled, turn it back on and try your video again.
In the future, make sure your letting the fan breathe. If it's on a bed or soft surface, your basically suffocating the cooling system.
If that doesn't work, let us know.
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