Should I worry?

[orange_gamer]

This problem just started happening today- in WoW, occasionally I have the whole screen lock up with the Windows Seven loading cursor, and then get DCed. This happens most when I hearth(to Hyjal of all places). I play windowed mode with the screen maximized.

This couldn't possibly be a brute force attack, could it? It's happened twice so far today. I changed my password already from fear of being antsy. I also have an authenticator on my account. Has this happened to anyone else?

Thanks for any help.:)