Apple has released iOS version 11.2.1, bringing a variety of bug fixes to iPhone and iPad owners. The update is available now, and you probably shouldn’t put off installing it.

Why? Amid the bug fixes is the solution to one particularly large bug, one that may not affect you at the moment but that could show up to ruin your day at the most inopportune time.

The arrival of iOS 11.2 brought with it a bug for some users, one that revolves around the camera. Upon updating, some users reported that their iPhone 8, iPhone 8 Plus, or iPhone X would have trouble focusing with the camera.

Users say the update caused a bug in which the lens would constantly hunt — that is, move back and forth — without actually focusing on the subject. That’s a particularly frustrating issue considering how many people chose the iPhone over other devices because of its excellent camera.
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https://www.slashgear.com/ios-11-2-1-released-heres-why-you-should-update-now-13511760/