The flaws are likely related to unstable power delivery, and may occur so randomly and only under specific conditions as to be nigh untraceable except in a controlled laboratory setting.
I had a problem with my Synology NAS once, where it reported intermittent power issues on all four drives at a rate of multiple times per hour. The probability of four drives having the exact same issue is near zero, or about as likely as the Trinity A-bomb would have triggered an uncontrolled chain reaction that set fire to the atmosphere.
As soon as I replaced the power supply to the NAS, the issue went away. I suspect it was a failing capacitor in the DC power adaptor causing a voltage fluctuation on the 12V rail.
Something similar might be happening here on the Mac mini, and all the power circuitry is inside the computer.
