Have had my phantom 2 now for a week and was on my 9th flight. I was about 40 miles from where I have previously been flying so thought I better do a compass orientation. Got the green flashing light so took off and hovered about 20 feet away on a beach, and then without any input from myself the phantom took off at about 70 degrees at full speed. I had to crash it to get the land and managed to crash at about 2 feet away from the sea, did some serious damage to Gimbal and the GoPro and broke every rota blade. The only thing that is different is that I have fitted FPV system but have had had two previous flights without any problems using that. Have managed to replace rotorblades and got it flying again but it hovers for a minute or so then hooks off at speed to the left or right and I have to crash it before it flies away. Anyone please help....???