How to Fix That iOS Bug That's Been Making Your iPhone Crash All Day
that when you receive those notifications the bug causes processor usage in your phone to spike to 100 percent. That in turn causes your device to heat up, which then causes it to reset. And it's super annoying.
Here's how to fix it
according to Apple support
update your device to iOS 11.2
. After you tap Download and Install, the download will continue even if your device restarts. Wait for the update to complete.
If you can't update, turn off notifications for all the apps on your device, then update your device to
1. Tap Settings > Notifications.
2. Tap an app, then turn off Allow Notifications. Repeat this step for each app.
4. After updating, tap Settings > Notifications and turn Allow Notifications on again for each app.
If you're unable to update or still have issues after the update,
contact Apple Support