I've had my MCX for a few weeks now. It has survived several crashes but nothing major. Now I've noticed that it wants to fly backwards. Full forward on the stick makes it hover but not go forward. Also at times It doesn't want to respond when I apply left aileron. I took the body off and noticed the aileron servo moves up fine but doesn't always want to move down. Any ideas of how I can fix this? This is my first helicopter so I don't know too much about repairing them.