ive had to re-do my settings a few times because sometimes while you have it hooked up to the computer the cable loses connection and what your changing doesnt actually change, its best to recheck everything even if it means changing the setup parameters
also check the position of the unit as i have seen something about earthing the unit itself because when the frequency of the esc and motor builds up it causes the swash to tilt, i saw this in a vid once, try spooling up with the heli held down and watch to see if the swash moves, if it does try earthing the unit, it may or may not help
in my experience though it is just the setup cable shorting and losing conection half way through setting up