There are some artefacts in shaded mode, but in render mode it s okay, it is happend when there are many object in scene, and when I use rhight click mouse to rotate view? but it wans early. It started few weeks ago. may be I change something in setting? Somebody? help me pleace
It might help to upload a file…
Hi @gknu2013
My initial guess would be “You are too far from origin considering the file units and tolerance”, but like @martinsiegrist already said: Post a file instead of having us guessing 
-Jakob
My guess is you have two surfaces in the same place at the fillet. With a look at your file we could tell a lot more.