Odd artifact in mesh only when rendering in cycles, starts at third frame Fairly new to Blender, having a confusing problem.

Have added some embossings to this book which was causing me some problems to get to not deform the initial book mesh. Eventually got there with that. 

Now when I look at it in the viewport everything is great. 
When I render out a 360 rotation animation in Eevee everything is great.
When I try to render out in cycles I'm getting this odd deformation starting at the third frame. Have checked if everything is unchecked, if textures are the problem etc. Theres not even a mesh line there, very confused.

Any help appreciated. Heres the blender file - https://we.tl/t-UuJ7ov2Lhp
One additional cut it solved.





But ... I cant find what it cause. I checked face orientation, shading type collision, make face planar, deleted all 88 thousand duplications (merge by distance), deleted all from scene (if it is not in hidden, isolated problematic face, unpluged material, tried Normals ... but nothing affect the issue. Only triangulation. Limited disolve to make n-gon back, brought issue back. Now Im interersted too :)

Definetely overlapping faces like n-gon tries to connect in two sharp angle?