The "natural" size on my TV has gone from "natural" to "full size". when I hit the "natural" feature it is still the full size with black on both ends. I can not see the whole picture it seems like it is always in close up vision. Hard to watch football and other shows with subtitles, as they do not show on the screen. I can only see the tops of the letters. This is driving me crazy. How do I fix it back to the real "natural" size?