I have a new Phantom 3 4K and put a Polar Pro light kit on it. With the kit on, my phantom is all over the place and switches into atti-mode at will. When I take the light kit off, the problems seem to go away. Maybe I am answering my own question, but since the battery unit mounts on top of the phantom, is it interfering with the GPS signal? That's too bad because I fly a lot at dusk and really like the extra lights.