I have found an issue that will crash the Bartok DAC with ROON when you play the BEAUTY AND THE BEAST MOVICE ORIGINAL SOUNDTRACK (TIDAL) MQA version.
You will find the the playback becomes strange and the DAC is freeze.
You have to switch off the DAC manually.
One of my friends with Bartok got the same issue as me. Please try by yourself.
dCS support, please check what is causing this issue too. Thank you.