crashing during stream 2 hours

My stream works perfectly fine at the start, but it varies on when it crashes. Sometimes it doesn't happen, but on average its once every 2-3 hours. It will instantly go from green to red on the bottom right, then on the bottom left it will say a disconnection error, and then establishing...

My OBS crashes on me roughly after 2 hours of streaming. The screen goes completely black and computer freezes. One minute later everything comes back on but OBS is closed and my stream has ended. I don't get any error message at all. Just a complete black screen. This has happened to me that...