it important not to fly too high, or you can lose it like that...
i flew my zagi yesterday, and i was flying fine, and the vagi went into, well, i guess ill call it a boomerang stall, because when i was turning around, the planes nose dipped, and it went into a spin. it hit the ground upside down. the plastic pit/motor mount was shattered. luckily, they only cost about 10$.