Thank you for bringing reason to this topic where everyone is losing their mind when it comes up. Cosmic rays are sexy, They're sciency, but they're not a good explanation when you actually run the math.

Random but flips are pretty much always bad hardware. That's what the literature says when you actually study it. And that's also what we find at work: we wrote a program that occupied most of the free ram and checked it for bit flips. Deployed on a sizeable fleet of machines. We found exactly that: yes there were bit flips, but they were highly concentrated on specific machines and disappeared after changing hardware.