11.1.2 iOS users around the world are faced with the problem, because of which on December 2 after 12:15 local time, the device begins to restart. Apparently, the bug is related to local notifications from apps that regularly about something reminiscent of the user. For example, if Headspace will send a notification that you have to meditate, your phone or tablet will reboot.
Reddit Some users were able to solve the problem by turning off the notification and Background App Refresh. Apple Support as an interim measure offers manually change the date in the number until 2 December.
Resetting and restarting the application responsible for the reboot, does not solve the problem. Probably, the bug is present only in iOS 11.1.2. Beta users iOS 11.2 until everything is not complaining.
Updated. Apple released the full version of iOS 11.2. In updating the company has corrected the errors described above, added support for Qi-charging device power 7.5 watts, and in the US Apple has introduced direct payment system Pay Cash.