Samsung UN75ES9000F E-Manual page 632

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