If the screen of the phone flashes, it is recommended that you:
1. Shut down and restart the machine.
2. If the mobile phone can be used normally, it is recommended to check whether the system has a new version and upgrade the system.
3. If no, back up the data (contacts, text messages, pictures, etc.) in the phone, and then restore the factory Settings.
If the phone cannot operate normally or the problem still exists after the above operation, it is recommended that you bring the purchase invoice, repair card and machine to the local Samsung after-sales service center for professional engineers to help you test.