Model great, but mesh is very weird! I do not know how to explain what is happening, I imported a model that I had saved some time ago. But it is with the mesh in a very strange way.

I already checked play for a new project, normals, remove doubles, decimate, merge vertex loose, but nothing solves!
Changing Clip value solved my problem!

The models were very large, I needed to increase the clips to view the models without limitations of view, but soon after I diminish them and that's where it began to cause problems.