Hi! It's hard to tell exactly as many things could be going on--from an Internet outage in your local area to something entirely else! Your best bet would be to contact firstname.lastname@example.org and let them know as many details about your difficulty logging in as possible. They also might be interested in taking a look at a few files from your computer to see if they could make any recommendations.
Sorry that you've experienced an interruption to your game and hope to see you in the skyways again soon!