There have been lots of opinions on the bouncing blade thing. Mine is simply from my own experience. I found the solution to be a tail rotor motor that is going bad. I am not an electrician, but it seems to be something to do with the current draw or something as they start to wear out. Maybe someone who is more knowledgable on the topic could explain it better to me (idf it is even possible, what I have suggested). Heck I do not know if it makes sense about the electrical stuff I mentioned.

That fix has worked for me, so perhaps it will work for you.

John Sparks