ORIGINAL: daytona20

I was encountering the same problem as well. I was outside and my cp pro would sometimes shoot up about 4 feet then right back down. Or sometimes the tail rotor would twich the nose to the left by about 45 degrees. Also the aleron control would just twitch and send the heli shooting briefly off to the right.

I ended up taking the rotor head off and disconnecting the motors and watched to see what would happen. I found that if i touched the right stick the right aileron control servo would momentarily activate and decrease the pitch on the right servo to sent the heli off to the right. I traced it down to a dirty potentiometer in the transmitter. I opened up the transmitter and took a can of contact cleaner specifically designed for cleaning electrical contacts in potentiometers and sprayed inside the potentiometer through an access hole. I then operated the aileron control to the left then to the right many times to clean the contacts (about 50 to 100 times). The cleaner I used was a product called nu-trol, however you could probably go into an electronics supply store and tell them that you suspect you have a dirty potentiometer and you need a spray on contact cleaner for it and they should be able to recommend a good cleaner for this purpose.

I proceded to clean each of the potentiometers in the transmitter and have not had any trouble with it since. Something you might want to check out as a possible cause.