Gary a little more info would be helpful , New bird or what ? Sounds like your battery came lose or a connecter did . Sure ya didn't pull the sticks down and in did ya ?
I am sure you know this dirk but most folks I bet don't.
More than 1 way to do a CSC shut down in flight!
found this the other day and in another forum.
also If I read right in manual it is possible to left stick shut down motors if the mode is set a certain way
http://download.dji-innovations.com/downloads/nazam-v2/en/NAZA-M_Quick_Start_Guide_v1.26_en.pdf
check out immediate vs intelligent modes
FROM MANUAL :
If you choose the Immediately Mode, yous hould not pull throttle stick under 10% during flight, because it will stop motors. If you do it accidentally, you should push the throttle stick over 10% in 5sto re-start motors.
(2) DO NOT execute the CSCduring normal flight without any reason, or it will stop motors at once.
(1) If you choose the Intelligentmode, and the throttle stick is under 10%, this will trigger the landing Procedure, in any control mode. In this judgment, pitch, roll and yaw controls are denied except the throttle, but multi-rotor will still auto level.
(2) In any control mode, DO NOT pull throttle stick under 10% during normal flight without any reason.