Some customers with Apple products may be experiencing issues with their device continually crashing. Affected devices will be on iOS 11.1.2. The issue is related to local notifications being received from apps that offer daily or repeat reminders.
If your device with iOS 11 unexpectedly restarts repeatedly on or after December 2nd this is what you need 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. To update to iOS11.2, tap Settings > General > Software Update > Download & Install 5. After updating, tap Settings > Notifications and turn Allow Notifications on again for each app.