I was flying the Phantom when suddenly I lost control. I look at the transmitter and the power light is gone. Luckily the phantom returned home and landed safely. I thought the batteries were drained but when I change to newly charged ones nothing happens. The transmitter won´t turn on. I have opened it up and I don´t see anything that could have cause it to shut off. The power plugs are in place.. Any idea what could have caused this?