Overzealous security feature, if you try logging in from a different location. If you get it even when you log in from the same device, then it sounds like something else is the matter. Being forced to change your password every time you try to log in from, say, your laptop as opposed to your usual desktop, is annoying, but normal.

Quote Originally Posted by Silamon View Post
I have been using the same computer and internet connection the whole time, unless it is because I am using a wireless connection? I'm not sure if that would cause it to lock the account or not.
Does it happen even if you log in to FFXIV, log out, and log in back again? Because it shouldn't. If it keeps happening although nothing about your connection has changed, I'd consider that as a possible sign that someone who isn't you IS trying to access your account.