take off problem

Hi everyone, I have a Phantom 3 Advanced which I have owned for over a year. I've performed many flights with this Phantom and not had any issues. I use the Litchi app because I like its features. Starting 2 days ago I cannot get the Phantom to take off. Usually what happens is when I perform...

Hey guys! I am having an issue with my vision 2 plus... On takeoff my copter is flipping, I have noticed that it flips toward the rear left rotor, or the front right rotor. I have not taken it apart or anything. The problem emerged two weeks ago, I was using it for wedding videography of the...