Logging in problem - Kronos?

First off, sorry if this is a dumb question or if this has already been answered. The issue is that sometimes when I go to log on, in the bottom right hand corner of the log-in screen it has the realm name Kronos, not my usual realm, Elysium. Whenever I try to log in with it saying Kronos in the bottom right it gets stuck on connecting. The only way I've found to get around this is to close WoW down for a while and come back and hope it's switched back to Elysium. Is there a way to switch it so I always log in on the Elysium realm and not Kronos, so that I don't have this problem? Again, sorry if this is a dumb question.