Many are having problems with MSI motherboards crashing and even more often just freezing. It's happening even to those using Linux OS instead of windows. Just go to this bugs page for Linux and put your "Find" on MSI and see all the hits.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1309578
I suffered this kind of problem a week or two. My computer keeps restarting when the games is just to begin. Its keep restart whether i run dota2/csgo in low quality graphic. And here is my specification of my desktop.
CPU : AMD FX-6300 Six-Core Proc 3.5Ghz
MOBO : MSI 970 Gaming (MS-7693)
PSU : 550w - Corsair VS550 ATX PSU
GPU : AMD Radeon R9 200 series
Memory : 8Gb DDR3 Kingston HyperX Fury
Cooling : Cooler Master
P L E A S E H E L P . T H A N K S !

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