Computer shuts down for no apparent reason

I have a pretty new desktop computer with win 8.1 x64

Suddenly my compuer starts shutting down and quit all programs. No warnings or anything.

Is there any way to check WHY my computer has shut down? Which process made it shut down or something?

No new programs recently, everything seemed like it was working fine

many thanks for any help

Edited ... by ZPKZ

rickjames

Checkout the Event viewer:

It might show whats happening if the issue something that would/can be logged

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