Hey guys, I had a rough day flying today. My screen said that the phantom needs compass calibration, so I calibrated it twice and it failed both times. I tried it a third time and it said that it was successful, and everything was green and ready to fly. I got it in the air, it seemed fine hovering like normal, and then all of a sudden it took off hard to the left and was like someone was pushing the stick all the way to the left. It was going away quite quickly but I managed to gain control of it and get it back closer to me and in a hover. It seemed ok then, but all of a sudden it started to do it again so i was going to try and land, and then it took off hard left again and lost altitude quickly and crashed right into a field. Thankfully it had snow in it and it seems to be ok. I fired up the rotors and one of the motors faltered for a second, but then it started working fine again and i can't get it to falter anymore. I'm a little hesitant to go and fly it again after that happened. I had a 7 mph wind, temp was 30, and I had 9 satellites. Any ideas what could've happened?