[A600]

I have the same problem with the 4K connected to a TV. As others stated, it can be fixed with these advandedsettings:

Code:

<advancedsettings>
  <video>
    <latency>
      <delay>-300</delay>
    </latency>
  </video>
</advancedsettings>

The -300 value is the sweet spot for me and can be checked with a video like this:



Two Coreelec boxes and an Nvidia Shield have no problems with the same TV.