Possibly drivers? Also are you able to see the menu of Play Game and the choice or Vulcan or DX 11? If so have you tried both and is it the same thing with the loss of connection? Not really sure about PC --> TV but maybe lower the refresh rate perhaps? Are you able to go into settings for what resolution to choose from? It sounds something simple just trying to narrow it down to WHAT is the cause going from patch 3 to 4.
