iOS 11 users all around the world facing iPhone Respring/Reboot bug. If you are facing this issue, you can try several actions to fix the bug.
Try to take these actions if you face iPhone Respring bug on iOS 11.
How to fix iPhone Respring Bug in iOS 11
- Update your device to iOS 11.2 – This should solve the bug
- Turn off Notifications for reminder apps till Apple releases the fix
- Go to Settings -> General and disable Background App Refresh till Apple releases a fix.