According to your description, I suggest you:
1. It is recommended to go to Settings-Application Manager-All -s Health-Clear Data/Clear Default Settings.
2. Do you have mobile phone security guard software or some third-party software programs installed in your mobile phone? If so, try uninstalling it.
3. Back up your important information and try to reset your phone (Settings-General-Reset-Restore factory settings).
If the problem still exists, it may be a mobile phone system or hardware problem. Please go to the nearby Samsung service center for inspection and maintenance.
It is recommended that you apply for "booking to the store" in Samsung official website and enjoy priority maintenance service:/pre-order.
After the appointment is successful, please bring your machine, invoice and warranty card to the service center you reserved on time.
If you have any comments, suggestions and comments, please click: support.samsung.com.cn/survey.