Pixhawk px4 throttle response

anyone else have issues after calibrating esc, exit calibration mode and go to raise throttle and no response until about half way up, then motor take off, then decrease throttle all the way and motors continue to spin for appr. 2 sec. I have changed esc’s thinking that may have been the issue but no resolve, some one please help, Do I perhaps have a faulty board?

@unmannedtech1 any idea’s on this one ?

Might be in ALTHOLD,