Why does screen go black for 4 seconds and then picture returns |Sony KDL52V5100 52 in. LCD HDTV

Question Product: Sony KDL52V5100 52 in. LCD HDTV
Question Details:
Why does screen go black for 4 seconds and then picture returns

Randomly screen goes black for a approx 4 seconds and then picture returns. DVR records the lost 4 sec. Problem started after firmware update from Sony in Feb

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