I keep having this issue pop up at random. I have a pretty decent build but for some reason, whenever I start streaming using OBS there is a chance that my pc will freeze at any moment during my stream. It doesn't happen all of the time. I can be streaming a high graphic game with no sweat and then stream a game like League of Legends and boom! Frozen screen! I have to hit the reset button on my tower. I don't think it's overheating because I'm monitoring that in a program I downloaded.