If your account being locked during login, it gives you options:
-prompt security question before login
-reset your password

Reasons account being locked each time you login

1. You are trying to login your battle.net account outside the country where your battle.net was created.
2. You are using the internet connection route thru VPN or Proxy server that is not in your country.

in example, if your account is created in Australia, and play in malaysia, you got auto account locked, then you need enter security answer everytime u login to verify

This post has been edited by squall0833: Aug 26 2012, 02:56 PM