Had some more confusing issues with printing and made another post: P1S got bricked while printing, took 4+ power cycles
It was discovered in that thread that the microSD card that came with the printer was sometimes having issues when printing long prints.
I have replaced the microSD card with a SanDisk one and reprinted everything that failed and have been printing with the Matte Charcoal color again with 100% success rate.
So the answer is that this was a failing and eventually corrupted micro sd card.