Weird dark gradient lines in cycles render

Support Lighting and Rendering
1

I can’t really show the error because of NDAs but I frequently find some of my cycles render have an issue like shown below(just an example). I have tried increasing light paths values to no avail. It usually happens when I use sun and a few area lights in a medium to heavy blender file(in terms of textures and models). Its like a gradient of black lines that come up in the top part of the render

image
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Has anyone come across this issue? I have and every time I need to redo the lighting and it sometimes just works on its own

2

Does this happen if you render with CPU only? Just to see if it’s a system or hardware related problem.

3

I use GPU for my renders. I’ll have to check if CPU works.

4

I think it’s a graphic card problem.
Please remove the GPU driver completely and try reinstalling it