Thanks for responding. A few points though: - As pointed out in previous posts i see the exact same stuttering behavior for all inputs that fall under "App" - so also when playing the same FLAC file from an SD card inserted to the slot in the Pro iDSD. So i consider it highly unlikely that my computer is causing an issue - i have tested streaming from different servers running Asset UPnP - a Windows 10 computer and a QNAP NAS (which runs a Linux derivative). - i stream from the same source same file to a different DAC (my Marantz SR6012) and there is no stuttering So overall the evidence clearly points to an issue with the Pro iDSD. A few questions regarding your post: - you say you played DSD256. That tells me you played via USB interface (App interface only supports DSD64). My posts refer to App interface, not USB interface - when you say "the computer decodes them [media files] to PCM" - that may be true for what Audirvana does when sending files via USB. But i do not believe this is how streaming from a UPnP server works. Most UPnP servers can transcode but this is optional.