Fetch Failed - Problem

Well i constantly receive this message, but I've no clue whats the problem. The page is online and works fine. Bildschirmfoto 2017-03-09 um 13

It seems your hosting provider is blocking one of the ajax calls. Open your dev tools and see which call it is, you can then inspect the request/response and perhaps get a better idea of what is causing that error. It's definitely specific to your hosting setup though.