Took my P3A to Ventura with me yesterday for the day. I updated the firmware before headed out to the beach. Had 3 great flights, and then on my 4th launch all looked good , but right after takeoff it appeared to go out of control. The P3 was not responding to my controller inputs and started flying away backwards with delayed responses to controller inputs. I figured I must have lost GPS, you will see at about 1:00min I flipped the switch to atti and back to gps in attempted to get it under control. It seemed to grab GPS for a second but then went back into P-OPTI. After a small heart-attack, I was able to get it back to me and land. The entire time I felt like I was herding a drunken flying monkey. After getting the nerve back up, I was able to make 3 more flights without a single issue. Thought my phantom was a goner there for a bit. Any ideas?