Game freezes but i still hear music

Ok, heres whats happening. I went to a random portal in ebeland and devias, i think it was to a dungeon, or a random place. all of a sudden the game screen freezes (in windows so if i move my mouse out of the screen my mouse still works).I hear music but nothing else.
And when i log off an on when i go to that character it automatically uses the portal again and i freeze, but i can close the game using the x at the top right. help please Thanks!