I'm also facing the same problem where my C15 will enter a restart loop when I play a tidal track. I then played a track from my hard disk and the restarting stopped.

Seems like a bug related to tidal. Hope they can fix this soon.

System: ML 53, ML52, Revel Salon2
Source: ML512, 818v3, Control:15, Apple TV
Cabling: Transparent Audio Ultra speaker and interconnect; Opus power cord
Others: Meridian F80