Character Movement Frozen

[yangman]

Five times now, the game had frozen my character in place and shut off all spells and movement other than weapon swing.

Care to clarify?

So, your character is able to make "normal" attacks, but unable to walk/run, and all other skills are unusable?
Where does it happen? Just anywhere or only when fighting against certain types of enemies? Is your mana orb empty? Are you surrounded by enemies?

Regarding the issue of Battle.net, if you've read the manual carefully, you will notice your characters are stored on Battle.net servers when you play on closed realms (which is where you are brought to when you click "Battle.net" from the start menu) where they are "secure". You cannot use your single player characters there.