Sony Tv Dark HD TV Fades Out When Playing Game With Dark Atmosphere?

HD TV fades out when playing game with Dark Atmosphere? - sony tv dark

I have a Sony HDTV and my TV tends to disappear after one or two seconds when I was in a dark corner or area. Then again disappears when I walk in a lighted environment. At my age, not Sony TV (HD), has never been done before. Is there a way to disable and how?