I finally managed to rebuild my quad and get it back in the air this evening, unfortunately it seems to have a fault and I'm not sure what is causing it.
Since it was the first flight and I wanted to be sure that it would fly in stablise mode before doing anything fancy, I simply tried to take off and hover pretty much in place. This worked fine to start with, minor inputs from the controller to rotate or strafe then it seemed to make larger and larger movements of its own will including gaining significant (proportionally. I dont think it was more than 10m from the ground) altitude. I reduced the power at this stage but then the quad started flipping from side to side resulting in it being upside down and then crashing.
I had my gopro recording from the car which I think shows the fail reasonably well, but unfortunately I am not experienced enough with these kinds of faults to know what part is it fault.
Hopefully someone will recognise the behaviour and be able to point me to a component or something to check.
I was connected to my netbook at the time over 3DR so should have flight logs if they are helpful - let me know which files are of use and I'll post them?
Any help gratefully received.
(youtube link if embed doesn't work)