Hi!

I have encountered this situation before, and I solved it by updating the system version. Don't know if it's the same as your situation.

You can try to update the system first, or flash the phone to solve the problem. If you can't solve it, go to after-sales service.

First, check whether there is any prompt to upgrade when the system update is under wifi network. If so, click upgrade.

You can also flash the phone to solve the problem. If you have backed up data before, or there is currently no data in the phone that needs to be backed up, it is recommended that you try entering recovery (turn off the phone, hold down the volume up + power button to enter recovery mode) to clear all data. Do not restore data after booting to see if the problem can be solved. If it still cannot be solved, it is recommended that you try to flash to the latest development version.

Please flash the phone according to the flashing tutorial. The sixth method is wire flashing: /thread-3104435-1-1.html

At the same time, please download the appropriate wire flashing package. ：/topic-mirom.html This is a flashing video made by Mi Fan:/forum.php?mod=viewthread&tid=2742326

A more detailed description of the problem will help netizens understand the trouble you are encountering and help you Solve problems more accurately.

Thank you for supporting Xiaomi phones!