It's weird, you can log in and start playing with the controller powered off and then turn it on once in-game and it's fine. But if you afk and your controller powers off, turning it back on doesn't reconnect it to the game.

Small issue for a very small percentage of users, but one I hope the techies will fix soon. In the meantime I'm trying to train myself to connect the USB charger when I go afk so it never powers down, or maybe just NEVER AFK. o.O