My Phantom is drifting, and I have to fight to keep it level. So I'm connecting to PT2 and calibrating(even if it says I don't have to). I downloaded NAZA assistent and got a message that I have to upgrade NAZA. First I couldn't connect, but suddenly I got connected. Tried to update, but got a message that update failed and I had to power cycle. Did so and now I can't connect to NAZAM. But I can connect to PT2. Also the led lights in front won't light. The blink on start up, but disappears after the initial start up. All this on a Mac. I tried to connect to a PC as well, but can't connect. Have removed the props for the update.