Shape Keys are Causing Discoloration During Animation

I have added some shape keys to open and close some elevator doors. The camera is inside the room and the rendered images are going from normal color to abnormal color at random. I tried rendering out the images one frame at a time, and again, it is a random result: sometimes rendering correctly, sometimes not. Is this a bug or am I doing something wrong? Any help would be appreciated.

The first picture is the good one, and the 2nd is the bad one.



you may have to post a file …

but off hand I would check to see if you have any extra Faces in that Wall that should not be there… Faces sitting on top of Faces will cause this kind of flicker as Blender tries to decide the ‘Z’ depth of two Faces at the exact same distance from the camera…