The issues above are not related to the Re-login errors that were mentioned in the original post. Those, fortunately, have been fixed by now! Further issues should be directed to Bug Reports or Support tickets.
On the matter of inability to login: check if you can download the update bundles. If it seems like you are getting stuck try to update the game while using a different network (public wifi, mobile Internet if possible, a different ISP), according to Support this has resolved the issue for a number of players. Failing that, please submit a ticket to Support with a more detail description of the issue.