Freeze and moved to lobby?

I dunno, could be a temporary network problem, that would explain why everyone stops moving. Being transfered back to the lobby could be because CrossFire detects the problem somehow and returns you to the lobby.

Honestly I think it's just another bug in CF, since this game is FULL of bugs. So you can wait for a patch to come out.

In the meantime I recommend you to check your network settings and to reinstall CrossFire, if this doesn't help, I should stand-by for a patch. If the patch (if it will ever come out..) doesn't work either, this is a system/hardware related problem.

Be sure to have your all of your drivers and directx updated properly.