Just happened to me while I tried to browse some of the sub forums.
Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@elektron-users.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Seems like it happened when I tried to load several pages from elektron-users.com simultaneously, i.e. listing posts in several sub forums at the same time.