CCB groans after hard use on Speciale

Searched this, no joy, sorry if redundant post.

350mi Speciale, 5-6th car I've had with CCB's, bedded in. Used pretty hard, used in wet the other day, no heroics, wet mode, a little groan initial braking bite then gone, <.5-.6 sec. Tele showed warm discs, engine, cold tires, ambient in 40F range. Tires 80-85F, no ABS engagement.
2d later, dry, car and brakes warm, ambient 40F-ish. Tires again 80-85F.
Couple clear road blasts to 120-150, rotors warmed up no groan, no noise. Slows from 120-150mph to 30-40mph, not full stop, no ABS engagement, probably 70% max braking.
Ugly groans F>R, no scrapes, no pulling, nada other than groan. Slowed OK, but noise constant throughout stop, no lessening as rotors heated. No smoke, pull, telemetry showed nl brake temps. Did on consecutive uses under same conditions.
After that, low speed stops had groans, rare squeak end of stop. Never had CCB car groan like this, and I've used them very hard. Pedal same as pre noise and throughout episodes.
Speciale has not been tracked yet, but did bed pads/rotors.
Happened Fri PM and Sat PM, so no dealer contact, didn't want to text tech on weekend, and car stopped, just really odd occurence for me.
TIA
L