Logo Randomly Disappeared From Site.

So I'm playing around on my site changing some shipping prices when all of the sudden I notice my logo on my website is simply gone. Haven't changed anything other than shipping and adding some products when it happened. WTH?!?! Got it back online by going into the theme editor and re-uploading the logo. Anyone have any idea what would cause that to simply disappear without messing with it?

Notice the favicon disappeared too.