Over in the 3D section there is a thread on the Aeroworks Extra 260 .60 size and some are saying theirs drops a wing when they snap it into a wall or in some other way snap full up into it.  It makes me wonder if they aren't experiencing some form of aileron servo blow back as my Extra does not do it at all.  As Mr. Matthews mentions above it is wise to go with more servo than recommended and mine are sized accordingly.  The manual recommends 80oz/in and mine are 144.  Just a guess but that may be their answer.