Been having this issue in fullscreen. Went into my logs and found out the game is messing with graphic drivers. Every 30 seconds or so the monitor will turn off then back on displaying "hdmi" as input. I fixed this issue by going borderless fullscreen. Definitely the games issue not hardware on our end. We have different cards. Mine is ati and yours is nvidia and we are experiencing the same issue. Mine is not a gpu or power issue. It's the game.