

Nowadays, things are documented pretty well. As long as the documentation is available, I don’t think there’s anything that would be common but mysterious.
However, if data is lost, pretty much everything becomes a total mystery. Like, popsockets and phone cases for example. How would you figure those out in a thousand years if you haven’t read any blog posts, reviews or marketing material about any of this stuff. If you don’t know how expensive, fragile and useful phones are, and how would you figure it out that people are so worried about cracking the screen? Pretty much none of that data is on paper, so loosing that information can happen very easily.
There could have been a defect that caused immense stress in the glass. Alternatively, there could have been microscopic cracks caused by mishandling. Or both. Either way, a tiny temperature fluctuation was probably the final straw that broke the camel’s back. The actual root cause probably happened several years ago.