From what I read on Roon forums…the 9018k2m from audiophonics has some issues.
Copied from roon forums :
“Received replacement DAC. With new DietPi installation it partially works now.
24bit playback with hifiberry DAC drivers is good, but 16 bit playback is noise with some music mixed in one channel.
No driver for ES9018K2M, and no workaround yet finalised to have serial drive of 24 & 16 bit sync for ALSA (=Roon).”"