I know NVIDIA on Linux is somewhat bad, but this bug has been driving me insane, and it is still not fix as of 535.104.05 my screen flicker even more than the last driver update
I hope this get fix in 540 drivers updates or later, but I’m getting an AMD GPU when I get to build my PC very soon.
Stupid suggestion, but have you tried replugging the Display cable into a different port of the graphics card?