The 2 I have delt with also restart on the first flip. So it has got to be a carb or reed valve problem.
Joe
ORIGINAL: deputydog
I'm running Duralite 5.6v reg on mine. After it would quit from me grabbing the tail(quick stopping makes it quit!) It would start right back up. Landings are noneventful but I usually kill the motor as soon as the wheels touch anyway!.