Reminds me of a former colleague of mine who was one of the principal developers behind an Android app, where they could really go to town on making it crash free, since Android offers a phone home function when a crash occurs.
At some point, he made the observation that 1-2% of crashes occur not because of a programmer error or anything, but "chance"; bit flips and the like, in either the app's memory or the phone's services.
So while on an individual basis it's rare, and in practice nobody will really notice an issue, statistically bit flips are significant enough to need attention.
I had a project where we were reaching for the 'cosmic ray' idea. But it turns out it was a supercap that did not hold enough charge on NAND during power off and the way NAND ages. It worked when 'new' but as the device aged and was used it the NAND would slowly take extra time to write a page. Eventually the time was just enough that it would mostly write everything. It would also sometimes randomly flip bits here and there depending on where it was in the write cycle.
At some point, he made the observation that 1-2% of crashes occur not because of a programmer error or anything, but "chance"; bit flips and the like, in either the app's memory or the phone's services.
So while on an individual basis it's rare, and in practice nobody will really notice an issue, statistically bit flips are significant enough to need attention.