Was that with or without your C10 core running over power line adaptors?

I think if store and core boxes were on same network switch, I cannot see what difference it would make as 'FLAC' files from store would not be running over same network segment as PCM data from core to audio endpoints. However if they were not directly on same switch and shared an uplink or power line circuit then I could see the possibility for some interaction.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).