Cheers Steve.
Motors are Sunnysky's so are very well balanced as they come. I've flown it with my Carbon balanced props and it does the same thing
The problem is - I can fly for 5 or 10 mins, or as in this case 10 seconds and it can flip over at any time. Seems to do it if there's more stick input from my end. The first time it did it I was just Yawing from side to side on the spot and it keeled over. Suffice to say - I have not flown at any height with it as it's totally unpredictable.
It seems unlikely it's a motor (I have tried another good set) or esc as it flies fine when it works! I'm thinking Naza. I have spoken with the dji dealer I bought this from and sent them the video too. I may try swopping out all the esc's too just to be sure though