Some help from you experts please. I was practicing Gesture control and got Spark into follow me mode which it did for a sort while and then lost me. It hovered front lights flashing yellow and also kept turning to face me' but not coming any closer or further away. Everthing I did to beckon it or get it to recognose me again failed and evetually I just had to wait for the battery to run out and Spark to land. Whathould I have done to get it to come back? As an after note when she finally landed it had been in the air 15.4 minutes!