I did a clean install of W10 with just one screen attached then I installed and upgraded everything I needed (BIOS fw upgrade and so on).
after everything was ready i attached my second screen.
Haven’t had any black screens since (1 day of use).
I’ll reply in about one week if I still have the problem or not. If I do ill test the system with another GPU since I don’t have a second system and I’ll keep you up to date.
Thanks for help so far.