Every now and then, we need to do some maintenance to Patreon.com that requires us to take the site down for a short period of time. Prior to scheduled maintenance, Patreon will give advance notice.
If you are unsure if the maintenance is related to scheduled cleanup or a site-wide issue, check our support twitter account: @PatreonSupport
If our support twitter is reporting that we are back up and you still see a maintenance window, try clearing your browser cache. You can test if it's just you or everyone by visiting Patreon.com in private/incognito mode as well.