I find that if the server crashes the relogger feature doesn't work properly. It gets stuck on the Realm Selection screen as shown in the screenshot below. After investigating the forums I found that the relogger should be relaunching WoW after X minutes defined in your settings profile. Despite having mine set to 2 minutes I find my bot stuck on this screen very often.
I have this line: <CloseIfCannotLoginWowMinutes>2</CloseIfCannotLoginWowMinutes>
It was set to 2, but still game does not relaunch. Get's stuck on the screen shown above.