I often face this issue where the actor disappears when the camera is moving away from the actor. Look carefully at the brown horse in the video (in the link) below..as the camera moves away from the horse, the horse disappears. Really appreciate if someone can tell me whether this is a bug or just a mistake I make. 
https://www.youtube.com/watch?v=V5mEpxAZbUQ (RENDER RESULT)
https://www.youtube.com/watch?v=5U5cxqosEV0 (STAGE MODE VIEW)

Did the brown horses' animation last long enough for him to get out of the scene?  Maybe check the timeline?