Just had the same symptom occur with Cura 4.1. Whole system crashed and went to black screen again. I had Cura open in the background. I would say the problem still is there. This only happens when Cura is open.
I have almost the identical system as the other user except I am using a Nvidia RTX 2070, and Cura 4.0.0 gives me the black screen of death after a short time...totally kills the machine. There must be a major killer bug in Cura. It seems to be random too.