I've read your information and have a question. How did you clean the joy stick? Did you use a contact spray, and if so, what brand was it? I"m having similar issues with my ST16. The Hardware Monitor show that the sticks don't always come back to center, or take their time doing it. I had my H at about 5 feet off the ground and it decided to drift left with no input on the joy stick. I was able to reverse the direction by pushing right, but when let go, it began going left again. I did land safely, but still wonder why it did that. I flew yesterday and all worked pretty well, though the J2 doesn't go 100 % in either direction. I'm considering using a contact cleaner, but want to make sure I get one that is safe on plastic.