Game full system crash 15-22 minutes, no bug splat

I have this issue, 970m gtx, i7, 16gbddr3, windows 10 anniversary edition. Computer freezes about 18 minutes into every other game, it puts the computer into a screenshot-like state, simalalrly described from other players. I cannot navigate to task manager, because the league application is forced to front, I even dual monitored and could not actively click on the task manager in the other screen during the crash. Stuff I have tried - Update Nvidia drivers. Uninstall fully, reinstall from scratch. Hextech repair function. Bought a better cooling pad to keep my temps at 60c, a very safe temp for my 970m (battlefield one at 1080 60fps gets far hotter than that, and I can play it for hours on end.) Lowered all graphics settings Ran in compatibility mode for Windows 8 Ran as admin I also in another ticket that riot closed provided my HW monitor data to riot for a full 40 minute game that I somehow made it through (after all it is every 2 games orso, while sometimes every game)

This has not only lost me ranked games but has been an actually damaging to my PC partially because I have to HARD SHUT DOWN my pc. This is insane that there is no fix. Please, please get in contact with us.