pascal-c
Sorry, you got it wrong.
The update stops because of issues related to the mirrors, it has nothing to do with root.
When you use sudo from a user terminal, that user gets elevated privileges (ie: it can do stuff that normally only root can do) for some time (5 minutes, in this case). If you try to use a command that requires elevated privileges inside that time frame, you won't be asked for a password again; it doesn't mean that you can't use sudo twice in less than five minutes.....
In short: don't touch sudoers, it has nothing to do with your problem. If your updates get stuck, simply stop the process (Ctrl + C in the terminal) and run sudo eopkg up again.
