That connection screen is extremely temperamental and sensitive to FPS drops, even by a couple of FPS, and network issues. I have had to (1) mess with re-plugging in HDMI cables, (2) reduce the number of switches between machines to get it to work reliably with 8 players, and (3) you want to make sure each PC only has one internet adapter enabled, else the game may use a different adapter. When playing with ethernet options, I noticed that for some, the initial discovery didn't happen, and for other settings, it did but the [GOOD] screen would eventually fail. Good luck.