I couldn't find the answer to this so I started a new thread. I've been flying my Phantom 3 Advanced for about a month without any problems, but yesterday (and today) it will only achieve takeoff power in Auto Takeoff mode. When I try a manual takeoff by pulling the sticks back to the center in order to start the motors, they start and appear to idle but when I advance the stick to add power the power does not increase. It won't even break ground. But, Auto Takeoff works fine in both P and ATTI modes. Yesterday when the problem first appeared the app reported that the controller firmware needed to be updated, so I attempted to update it this morning and it appeared to already have the current version installed. And when I went to fly, the message about the controller firmware was absent and everything reported normal. So I flew it normally. Then towards the end of the flight with the battery at about 40% when I was practicing takeoffs and landings, the problem reappeared. Does anyone have any idea what might be the problem? Thanks in advance.