I have a weird question:
Is this happening on any particular page/game? I had a pet theory that overloading was due to someone trying to flood a server with requests in the hope of an embedded HTML5 frame throwing a descriptive error messages giving away their particular vulnerabilities of the server the actual game is hosted on. (ie. If a dev is lazy an Nginx error page could trigger -- giving away that it's vulnerable to Nginx-specific attacks). But it seems all you offer are asset packs, right?