idk but its still closed beta, small errors like this tend to go away when the real game comes. just wait till open beta comes, im 90% sure it will go away.
also check if your system requirements are decent
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I haven't frozen at all. Only error I've received was a graphical error that locked me in place during a dungeon, but I just used the "transport to safe location" function to move.
I'm pretty sure the point of closed beta TESTING is for people to find these bugs and report them so they can fix it. Go report it on the forums or bump some popular thread regarding the problem.
i notice when my client freezes or is not responding i press CTRL ALT DEL then start task manager...and by the time my regular screen appears the game is just fine i have Windows Vista still...