My first Blade CX had an odd issue where the servos would twitch suddenly before returning to normal... sort of like an r/c version of Tourettes syndrome. The heli would hover and fly just fine, then suddenly the servos would twich and it'd zip momentarily to the right or left, backwards or forwards (but never up & down)...
The guys at Helihobby couldn't figure it out, so they swapped it for me and put it aside for the manufacturer to look at. We suspect it may be a bad 4in1 board, but batteries and transmitter were definitely not the problem.
ORIGINAL: fxt
Well, I called Horizon Hobby today and they told me it was probably the 4in1 and said they would replace/fix the problem. The only problem on my part is that I have to send the whole heli back to them so they can make sure it is that. They would not send out a replacement. I forgot to mention before that I have three batteries for the heli and the same problem happens with each one. Maybe the charger is bad. I hope the turn around on repairs is fast. Thanks.....