Game crashing during night fly, monitor shutting down. Have to restart PC.

Hello. DCS Open Beta has been crashing my PC but only when I fly at night. When flying during the day there is no problem. If I put the mission in night time that late when there is no sun at all, the game will crash. This is only for the Beta 1.5. I fly for a couple of minutes and then here's what happens:

My screen goes black as if the GPU just went off. No matter what I press nothing comes up on the screen and soon the monitor says "No input. Entering sleep mode", so I have to restart my PC.

System specs:

CPU - Intel Core i5 3.2 GHz

GPU - NVidia GeForce GTX 560 2gb VRAM

Memory - 8gb

I have more than 10gb free SSD space where I installed DCS Beta.

I have only flied at night twice. I don't want to mess up my PC by risking to do it again. Both times I flew MiG-29A but I doubt it's the plane module that's causing this problem. I also searched but couldn't find anyone else with a similar problem, so I apologize if this has been posted before without my knowledge.

Thank you. :helpsmilie: