I experienced that as well a couple of times a few minutes ago. Sometimes the server (any server) will "hiccup" and the database won't be available for a moment, and if it happens at the same moment a process you are running makes a query, you will get an error message. Romanos will likely get a detailed accounting of the error(s) by email...this is what I get on the site I admin.
Thank you, by the way for bringing this up...it is always good to hear about such things when they happen because it can be useful information to a site admin.