Has anyone ever been in this situation? After the phone was restarted, all the information in it was gone. It's Xiaomi's mobile phone.

There is no text message after the phone is restarted, which may be due to system reasons or poor power supply of cpu. You can restore yourself first, and then contact the manufacturer's repair shop to replace the motherboard. If you resume your operation, you can download a mutual shield mobile phone data recovery software to scan the mobile phone comprehensively, and then you can choose to resume when you see a short message in the file type! Good luck!