Recently there was this: https://news.ycombinator.com/item?id=47252971 "10% of Firefox crashes are caused by bitflips"
Which makes me think a small amount of random issues which happen even though nothing is broken, is normal everywhere. Especially once move things around on a network, there's potential for a lot more random errors.
This is why data hoarders who have NASes with lots of space insist on running their servers with ECC RAM despite it being significantly more expensive. Because bit flips, for all intents and purposes, cannot happen. The RAM itself detects and corrects for them.
I wouldn't expect bit flips to be a significant contributor to enterprise problems.
If your network goes down because of a DDOS, or part of your system overheating, that's an internal issue you had control over.
If a bit flips because of cosmic radiation, you can't really do anything about that, and it's utterly unpredictable. That's "random" to me.
It does require constant tuning and adjustment though.