Shadow artifacts

Hi, I get strange shadow artifacts on a curved wall. The other walls that are straight looks correct. I have tried to turn of the shadow in every way but nothing helps. It looks also strange with a one-coloured material so it does not depend on the brick-material. Also, turning off Cast Shadow does not help. The only thing that makes the wall look good is if I click on Unlit but I still want it illuminated.

Your lightmap resolution is too low.