I wrote a few days ago about how broken iOS app updates are, because they’ll get stuck mid-update and then never finish. Worse, they’ll get removed from the device if you reboot with them in that state, and I think they might get removed sometimes even without the reboot if the update never finishes.
Tonight I was showing my wife how updates keep failing on me like this, and she started checking her own iPhone. She found three apps that had magically disappeared off her iPhone, and for all we know, there may have been others. If you guessed that they were all apps that have had recent updates, you win an imaginary million dollars. Granted, she would have noticed next time she wanted to use those apps, but like I said before… very stupid problem to have, Apple.