You have intermittent loss of audio or video.

Check the cable connections and reconnect them.

Loss of audio or video can be caused by using overly rigid or thick cables. Make sure the cables are flexible enough for long term use. If mounting the TV to a wall, we recommend using cables with 90 degree connectors.

You see small particles when you look

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Samsung PN64E8000 manual You have intermittent loss of audio or video, You see small particles when you look