Game freezing entire PC, forced to hard reboot

Sometimes my game freezes and the mouse no longer responds and I must hard reboot by holding down the power button on my desktop tower, which immediately turns the computer off, then I have to power on again and reboot Windows. What can I do about this?
 
My old PC had same problem, my issue ended up being an over hest problem. Main cpu cooler was checked. Each time I got to station with other cmdrs in workload made it heat up.

Set a temp warning in your bios, if you hear it going off while playing, them you it is...
 
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