

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.
The USB law.
When you try to plug in a USB-A connector, there’s a 70% probability it won’t go in. Mathematically it should be 50%, but I don’t believe that.
You switch it around, and there’s a 30% probability it won’t go in. This is not something they taught at school.
You switch it around the third time, and there’s a 5% chance it still won’t go in. Your mind begins to melt down, you switch and insert repeatedly until it finally works sooner or later.