Most of them are caused by battery aging or motherboard failure, so the following troubleshooting is recommended:

System troubleshooting:

1, restore the factory default settings.

2. If it is still the same, redraw the system.

Hardware troubleshooting:

1, replace the power supply test, replace the USB data cable test and other aspects to troubleshoot problems.

2. If it is still not good, it is recommended to send it for repair and after-sales inspection and maintenance.