I have just recieved my crusader 190.
I have set up as per instructions, loaded cleanflight,
My tx inputs/ max min etc are stable.
I have calibrated my esc. all seems stable.
This happens in Acro and Auto level.
However when I increase the throttle slowly it reacts erratically and the 4 motors increase/decrease wildly...
I have read this might be a PID issue, or just a dodgy naze board.