FLASH HOBBY D3542 1250KV Brushless Multicopter Outrunner Motor for Mini Multicopters RC Plane Helicopter (1250kv)

Running on 14.8v, plenty of power, old aerostar .20update, While operating my plane, starting making a very concerning noise landed, did a rev test, the motor completely blew-apart. The prop pulled the motor apart. Not sure if the circlip on the back was never there or some how just came off. I've had about a dozen flights with no problems. Would be nice if FLASH HOBBYwould return my concern. STILL NO RESPONSE 11/19/21