Hackintosh OS X High Sierra Black Screens at random

Hey there!

I've finally managed to make my Hackintosh able to boot up without the USB Drive. However, I've an issue. Sometimes, I get a black screen when in the middle of some activity. Don't know what set of actions may be causing it.

I suspect it might be something to do with the GPU, maybe drivers. Do you guys agree or it may be something else? And how to fix it?

Here's the PC configuration:

Dell Optiplex 980

• CPU: Intel Core i3 530
• GPU: NVIDIA GeForce 710 2GB

Thank you for your help!