Sager NP8177 shutting itself off

I have a brand new Sager NP8177. Not even a week old. It has shut down three times while playing games. The screen just goes blank. I have HWmonitor running and both the cpu and gpu are getting up to 77-80, but possibly more, degrees.

I have windows in high performance mode, gaming mode, and nvidia is set to performance mode.

So is this overheating? What can I do?

Sager NP8177 shutting itself off