I also have this problem and the odd thing it suddenly started to happen…
I was doing a bunch of Unreal tutorials for 2D games (Udemy Cobra Code) and I spent hours in Unreal engine working just fine.
Then suddenly now I cannot work more than 5-10 minutes in my project and the screen turns blank.
I first thought it was overheating of the GPU or something but now I tried running heavy games for extended periods and this happens sometimes even when I am just inside trying to edit something simple like a Blueprint och Sprite etc.
I will try to investigate more if the project might be corrupted or something, but that should not crash the whole UE/Graphics card?