Hi, I have an Apple TV 4K. When I first bought it (as soon as it was released) it had an issue where if it was woke from sleep, the TV would not detect the signal. I had to reset the device by long pressing both menus and home button. This problem was fixed in a later release of TvOS, I can't remember which one 11.x. Since TvOS 12.1, the problem has started happening again, it did not get fixed in 12.1.1 Is anyone experiencing this, it is really annoying.