Material bug

Development Rendering
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Hey, I'm getting these strange lines when there is not enough light on the scene or in shadow. In real-time rendering, they are not visible. Only in path tracer. Any ideas why they are showing?

Models are from Revit and InfraWorks

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EDIT.1: I found that sleepers file is doing this but I don't know why...

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EDIT.2: Collapse all fixed this issue. I'm not deleting this post if it is in help to someone.

EDIT.3: Files from InfraWorks have same issue but I cant fix them. Ideas?

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This worked only for my Revit files. I have same issue with mu files from InfraWorks but I cant find way to fix it. Do anyone has ideas? I can share my files to check it if its need.

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模型尽可能靠近坐标原点，或者调节镜头景深参数（很玄学，但有用）。 以上只能做到尽可能的减少这个问题所带来的影响，并不能完美解决，只能等后续的官方更新了。

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this bug also happened to me once when I have many glass surfaces all together. Never fixed, have to switched to D5render and Vray+vantage for the project. Sad story.