How reliably does your ATV 4 reconnect with your Bluetooth headphones when you turn them on? Mine is very spotty. There's no way to manage the connections, so I have made sure that each BT transmitter I have connects to only one receiver, iPhone 7 to Bose Revolve, Avantree Leaf to Sony MDR-1000X, and ATV 4 to Avantree Saturn Pro. The first two are flawless, and the Saturn Pro did connect reliably with them when I tested it.