This is what I'm confused about....For SD, the Axis mechanism can be defeated. There are many factors that come into play. One is the grip which holds the folder. The thumb can be the culprit. Another is dynamics involved. There are too many unpredictable factors that may come into play.
I've tried my 710 in every grip I can think of, and I simply cannot cause it to fail by accidentally disengaging the lock.
So I'm curious as to what exactly you guys are doing that cause the Axis-lock to fail.