any help

[bladesufc]

heres a vidieo of my phantom fc4o going daft starts ok the second flight it decided to go stupid with no control came down like a stone no damage and flew ok just after not sure what happened the problem starts at 03.57 here is the vid http://vimeo.com/86508817

 

[james1969]

heres a vidieo of my phantom fc4o going daft starts ok the second flight it decided to go stupid with no control came down like a stone no damage and flew ok just after not sure what happened the problem starts at 03.57 here is the vid http://vimeo.com/86508817

It could have been a thermal ? Looking at the weather.