Software conflict
Some installed applications may conflict, resulting in all software not working properly. You can try to uninstall the recently installed application, or solve the problem by forcibly closing the application.
Operating system error
Your operating system may encounter some errors or abnormal conditions, resulting in the software can not run, but also can not be shut down or restarted normally. Try a soft restart (hold down the power button and the Home button at the same time until the Apple logo appears) or a hard restart (long press the power button and the volume reduction button) to solve the problem.
Insufficient storage space
If the storage space of iPhone is full, new applications cannot be installed and existing applications cannot run. You can try to delete some unnecessary files or free up space by cleaning the application cache.
hardware fault
In rare cases, hardware failure may also cause the software to fail to open, close or restart. If the above measures are still ineffective after you try them, it is recommended that you contact Apple customer support or go to an authorized repair point for repair.