Thanks Derek for your experience.The Tidal / Sooloos / C15 combination here is now useless.

Cannot play any Tidal material without C15 going into reboot loop.

Power cycling C15 has no effect. I have to reboot C15 and 2x MD600 to return to square one. Seems as if the Core on one MD600 is affected

I will try Tidal on Control:PC with Sooloos App on Touch:PC later and report back.

Very disappointed Hector

AV: Thorens TD160B, SME, ShureV15MK2, 500, 598, 861v4, DSP7200.1, DSP3300HC Samsung UE55, SkyHD.
DINING: MS600, AC200, DSP5200SEUG.
STUDY 504, Roon Nucleus + RevB, 808v6, 5200SE, Mac & PC (Touch Screen), Prime+PS Grado GS1000i
HORIZONTAL: M80, MS200, Red Rose Spirit + Sonus Faber Toys, iPad Mini
A capella to Zydeco