So this has happened once before when I was playing Far Cry 3, I learned (thanks to these forums) that one or two of my case fans stopped spinning. I'm currently using an AMD Phenom II x6 1055T. I know it's not exactly a new processor, but really I haven't read anything bad about it. Now that I'm playing ARMA III, I cant get more than maybe 20 minutes in (Most of the graphics are on high/very high, but things like draw distance are turned down a bit because I know those are processor intensive) before my computer just shuts down.
So my question is, what's the first thing I check for? Is my thermal paste bad? Can that even happen? Should I think about replacing my processor soon? Or am I long overdue for an upgrade (hope not).