Random black screens

Hey guys,

I'm really despaired to fix random black screen issues on my hack. I even can't find the real reason of it.

Black screen/system freeze appears randomly when I'm surfing internet, watching Youtube videos or using Logic Pro.

It looks like system freezes with black screen. Signal from my dGPU is still going to my monitor, but monitor is black and there are no any sound or signs of live. And to use my hack I have to reboot my hack.

My specs:

• Opencore 0.7.0
• Catalina 10.15.7
• SMBIOS 19,1
• ASUS STRIX Z390I
• 9900K
• Corsair 32GB RAM
• Corsair MP510 SSD NVME
• Samsung 128GB NVME (with Windows for dual boot)
• Broadcom wi-fi/bluetooth (replaced Intel chip)
• PowerColor Red Dragon 5700XT 8GB
• Corsair SFX600 PSU
• Monitor Samsung with 4K resolution connected via DP

Everything works perfect except these random black screen freezes. What I tried already:

• No overclocking at all
• Updated BIOS
• Changed DP version on monitor to 1,1
• Tried different SMBIOS - iMacPro 1,1 and MacPro 7,1
• Stress test CPU and GPU benchmarking - everything's fine
• Removing second SSD drive with Windows system

Here is the link to my EFI folder (I removed my Platform Info like serial numbers etc) - https://easyupload.io/4bpwg3

Maybe someone could advise me at least how to find the problem? I'll appreciate any help.

Thank you.