Picture and Sounds blinking on and off

I just bought a new Samsung TV.  New HDMI cable.  Tightened all coaxial cables.   Even replace the one from the router to the cable box.  The pictures and sound blinks in and out.   I have tried using the app to get it to fix.  This is our primary box.   Our 2nd box/tv has no issues.   It will work 1 day then not the next.   I am spending a lot of money and everything should just plug in and play.  

How do I fix this?   When I get the screen to show I have adjusted the display options.  None work.