Hi @Markus_von_Kienlin ,
Exit Code 6 is related to an issue with formatting internal storage, this can usually indicate a problem with the internal storage device or with the connection to it (cable for example). But I also noticed that RoonServer isn’t running correctly due to missing codecs. Can you try to install the Codecs and see if that helps, if it doesn’t, then I suggest checking the cable on both the drive and motherboard side.