my brother and i each got dragonfly 4s for xmas. immediately noticed that his "beeped" when power on and mine didnt. was'nt sure which was right, beep or no beep, then it answered itself. mine will kick into full throttle on its own!! everything works fine on simulator, so i think problem is in heli. everything responds to commands i make, except for the throttle has a lag. if i push full throttle or kill throttle it takes about 10-20 seconds b4 it reacts.....my brothers is immediately. i can let it sit idle and it will kick into full throttle on its own, only way i can stop it when it does this is pull battery from heli. any help?

note; i did switch crystals between our heli's to see if it help. nothing was different. i also turn controller on first and have checked connections.