had a scope go bad on me while out hunting. first noticed that when I went from 4x to 16X lost all field of view and very blurry. I only can see through scope when on 4x now . soon as you move power ring the site picture goes down to pencil dia. and very blurry . removed scope and could hear a small rattle . have not dropped it or anything just went bad . I guess it has to do with the mechanics inside not moving correctly . Any thoughts of what might has caused this? thx! Mark