The following ways are suggested to solve the problem: 1. If you haven't cleaned up the system background application and cache for a long time, please clean up the background application and cache in time. Operation path of cleaning cache: click mobile phone housekeeper > cleaning acceleration, and the cache is cleaned. 4. If you install too many applications, please clean up the unnecessary applications in time to keep the phone with enough memory space. 5. If you haven't charged for a long time, please charge your mobile phone in time and try to keep the power of your mobile phone above 20%. 6. If other third-party mobile phone housekeeper applications are installed, it is recommended that you only keep the mobile phone housekeeper applications, so as to avoid conflicts caused by the simultaneous operation of multiple housekeeper applications in the mobile phone and affect the normal operation of the system. 7. If your network is unstable or the signal is not good, please try to connect to a data network or WLAN with stable network speed and signal. Network instability will lead to the delay of network applications and slow loading when playing online videos and online music. 8. If you haven't restarted your phone for a long time, please restart your phone and try again. Restarting your phone can help you clear some cached data and improve the system speed. 9. If multi-task downloading is carried out in your background at the same time, multi-task downloading will occupy the running memory of your system, resulting in slow running. Please avoid multitasking downloads at the same time. 10. If your application has not been upgraded for a long time, please upgrade it to the latest version. In daily use, it is recommended that you upgrade your application to the latest version in time, which will optimize and upgrade some known problems. 1 1. If your system has not been upgraded for a long time, please update it in time. The system update will fix some loopholes and problems in the old version and ensure the safe operation of your mobile phone. 12. If the above methods still fail to solve the problem, it is recommended that you back up important data in advance and bring the purchase invoice to Huawei customer service center for testing.