Have you encountered crashes in IOS 11.1.2. Well I have on all my Apple devices.
It happens when some apps give notifications when the time has passed 12.15 on December 2.
The device simply crashes and you have to restart, the current state is not saved. Meaning for instance that position in a book is not saved, the webpage you are reading is not saved etc. etc.
Read more here
Here is what you should do:
Quote:
If your device with iOS 11 unexpectedly restarts repeatedly on or after December 2, 2017, learn what to do.
Use these steps to turn off notifications for all the apps on your device, then update your device to iOS 11.2:
1. Tap Settings > Notifications.
2. Tap an app, then turn off Allow Notifications. Repeat this step for each app.
3. Update your device to iOS 11.2.
4. After updating, tap Settings > Notifications and turn Allow Notifications on again for each app.
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I did that and it seems to work.
If you don't turn off notifications as described, then you risk that your device crashes before the update process takes over.