Click run,two windows will open,in the top window called "system summary" you will see info about your pc,in the left half at the bottom there's info about your bios,i'd like to see which one you have.
After this close the system summary,then look at the main window,at the left top there you can click "sensors",do so,see what temps you have when playing a game.If you want you can upload some pics of this sensor window or else make a log,
How to make a log,
open it Hwinfo,
check "sensors-only" (in that first little window at the right),
click "run",
at the bottom of the window click "logging start" (four buttons at the bottom of the sensor window,one is this one),
choose a name and place for the log like "hwinfolog" at the "desktop",
this log can be viewed/opened with either excel from Microsoft or libre office calc.
you can upload it onto a site which facilitates this like
SaberCatHost or
DropBox,these i like since not so much (or any) spam comes with these.
Just make one until this happens like you described.