Mesh faces not rendering correctly

My mesh is closed and i tested the normals and the report says that they are uniform. And i tried rebuilding the mesh. Some facets are not rendering correctly. Rhino 7 (7.4.21067). Any suggestions?

where did that mesh come from? Was it from a nurbs model? If so you may want to look at the original model and see if it has any errors, correct them and mesh again.

looks like there are self intersections that are screwing up the normals.

try extractmeshfaces on a few of them and see if they correct themselves when they are broken free from the rest of the mesh. If so you may have to pick through there and see what is connected to where to see what got screwed up.

can you post the mesh?