Im very new to quadcopters. I have, actually had an X4. It is a tree now and I'm awaiting a replacement. I decided to get something a little larger so bought a V222 from Banggood. It will fly fine and then drop to the ground, in complete control, at random times. I bought the switchable transmitter because I had read it was much better but it didn't fix the problem. So far banggood has not offered to help and I don't want to keep throwing money at it. I want to get a phantom when I can fly better. I assume it is the controller that is bad. An thoughts?