Fwiw (tangent), I don't necessarily believe either of those instances were cosmic-ray induced bit-flips. I'd have to dig up the study, but I read a study once that more or less concluded "cosmic-rays are more common in memory unsafe languages and on overclocked PCs". Or more accurately, engineers frequently misattribute memory corrupt and operating outside specification to cosmic rays.

Particularly when the software in question is running on somebody else computer, proprietary software and OS (or OS modules), unknown patch versions, etc.