Everything was working fine until a few days ago. Turned on the phantom and went for takeoff but nothing happened when throttle stick pushed forward. When I push left or right it will throttle up...sort of. Right stick is doing almost nothing. One I do get it in the air, it will throttle up but does so very slowly and will throttle down very slowly. In order to fly forward I have to push the left stick to the right. It's almost as if they got reversed somehow but the user interface says that everything is correct. I've checked and re-checked. Not sure what the problem is. Could this be caused by low controller battery? EDIT: calibrated transmitter and now all seems to be well. Just a fluke. Leaving this here for anyone else that may have the same issue!