I crashed last night after replacing the blades I took it for another flight when I was calibrating the gps the first spin I did it turned green with out facing it down and doing the second spin. so I did it again and it turned green again on the first spin. I noticed when I power on the phantom 2 it blinks red once then starts blinking yellow. never has done this before I have taken it apart and inspected the gps puck on the top housing no cracks I have inspected all the connectors and unplugged and reinstalled them nothing looks out of place. when I fly now it is in gps mode on the transmitter but doesn't stay in one place fly's like it is in manual mode. thanks for any help!!!