Screen tearing and shapes

My Fairphone 2 have started to screen tear and there are loads of triangles and rectangles in grey and white showing up on the screen, especially when scrolling or moving between programs.

I could not find much information about it here. Anyone had this problem and solved it or who knows how to solve it?

I have taken of the screen and refitted is.
The Fairphone updater says Fairphone OS 18.04.1


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