Before a month, I used to play in high graphics settings for 24h and no issue at all.
Now every time I start a match, I got black screen!! And I must restart the PC!
I cleaned my whole PC 0 files + deleted the game and downlaod it again + scanned by anti-viruses + deleted my video card driver and download it again + update drivers and my PC system + cleaned my PC = I still face the same problem!!!
Now I can only play in low graphics settings 
My PC:
i7 6700k
AMD R9 390 8GB
RAM 16gb 3000MHz DDR4
How to fix it?