Thank you for your support of Xiaomi products.
For your reference, here are some solutions to resolve this issue:
1. Clear background APPs: Close unnecessary applications to reduce power consumption;
2. Disable auto brightness: Go to [Settings] >> [Display & brightness] >> turn off [Auto brightness] and set the brightness to an appropriate level;
3. Adjust refresh rate to 60Hz: Go to [Settings] >> [Display & brightness] >> tap [Refresh rate] >> select [Custom] and set to 60Hz;
4. Disable advanced textures and sunlight mode: Go to [Settings] >> [Display & brightness] >> turn off [Advanced textures] and [Sunlight mode];
5. Enable battery saver or ultra battery saver mode: Go to [Settings] >> [Battery] >> switch [Current mode] to [Battery saver] or [Ultra battery saver];
6. Enable memory cleaning after screen lock: Go to [Settings] >> [Battery] >> [Additional features] >> set a cleaning time through [Clear cache when device is locked];
7. Disable system haptics: Go to [Settings] >> [Sound & vibration] >> turn off [Haptic feedback];
8. Disable notification effects: Go to [Settings] >> [Wallpaper & personalization] >> [Notification effects] >> select [None];
9. Set AOD to off: Go to [Settings] >> [Wallpaper & personalization] >> [Always-on display] >> switch it off;
10. Set lock screen in 15 seconds: Go to [Settings] >> [Lock screen] >> tap [Sleep] and select 15 seconds;
11. Disable double tap to wake and raise to wake: Go to [Settings] >> [Lock screen] >> turn off [Double tap to wake or turn off screen when device is locked] and [Raise to wake].
If these solutions do not resolve your issues, please submit feedback via your phone, and we will be happy to assist you further.