Soft Raytracing Shadows are flickering

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Open the Project and pilot the camera around, see lighting/shadows are flickering, meanwhile a small square image on top left.

The reproducing might not be 100%, moving around, or selecting the camera or something in the viewport, or More area lights with soft RT shadows are easier to trigger it.

r.shadow.denoiser 0 could fix it

I also searched around, it's kind of a common issue especially for those Animation Studio who are using heavy content, it was reported often. 

A UDN ticket:

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Here's a thread about NV driver might be the issue for your reference
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