Mine did the same exact thing. 6 dead sticks and some were near wrecks. I did many things including buying a new carb, and a draft block on the diaphragm vent. Nothing fixed it. I sold it and bought a ZDZ 50 NG. Those problems are all gone. Same exact air frame, different engine and the problems all disappeared. The only thing I miss about the DA was the easy starting. The ZDZ took some learning but now it starts on the first flip after priming.