Actually, my last flight I almost lost all elevator control. Huge elevator flutter. I was able to get it on the ground only by luck without much damage. Upon inspection I found that the crimp on the cable slipped which made a bunch of slack. It was my own fault. I double looped it through but I guess my crimp wasn't good enough. It was my own fault. I normally use pull pull on my planes and this was the first problem I have ever had. Just remember to double loop and crimp good and tight. Also, make sure there isn't any slack. That will give you flutter. Just don't make it too tight as you can ruin your servo.