I have had several successful flights with my Vision Plus. gps, and Fail Safe work great. However, i can not get Home Lock or Course Lock to work. All i need to do is move the left hand s2 switch down two positions to the bottom position and pull back on the right hand joy stick, right? To get it to come back to me. Course lock position has no affect either. What am i missing, or, what should have i done, or, what is wrong?