Moderators are usually more inclined to respond if you follow the outline in the stickied thread:

http://forum.square-enix.com/ffxiv/t...hnical-Support!

Character shaking happens to everyone. There is nothing that you can do to prevent it from happening. SE should already know about this from previous threads, but you're more than welcome to remind them.. because it bugs the heck out of me, too.