Here are the steps that can help you fix this problem or visit the link:
https://consumer.huawei.com/eg/support/how-to/detail-troubleshooting/en-eg00793965/
Close running applications that you are not using
To close the running applications one by one. - Tap on the navigation panel to view all the apps running in the background and close them by swiping up.
To close all applications, tap the navigation panel to view all applications running in the background.
Clean junk files and other apps you don't need
Go to Optimizer and then click Clean.
Select the files or apps you want to clean to free up space on the phone memory.
Uninstall applications operated by third parties
Tap and hold on the app you want to delete.
Click Uninstall.
Turn off power saving mode
Go to Settings > Battery and disable Power Saving Mode or Ultra Power Saving Mode.
Make sure the battery level is above 20%.
Restart the phone
Hold down the power button for 3 seconds.
Choose Restart.
Try to restart your phone every 2-3 days.
Upgrade your system
Go to Settings > System and Upgrade > Software Upgrade > then tap on Check for Upgrades.
Make sure your battery is at 30% or higher, that your phone has enough storage space and that you are connected to Wi-Fi.
Backup data and restore phone
Go to Settings > System and upgrade > Reset > Reset phone before performing this step and make sure your data is backed up.
If the problem persists after restoring your phone to factory settings, take your phone and proof of purchase to the nearest authorized service center and we will help you.
