Troubleshooting Guide for Hanging/Lagging/Slow Response

1.Fault Phenomenon

1.1 Slow Response： Slow response while starting/exiting the application, Slow response when brightening the screen
1.2 Lagging, hanging system, hanging application

2.Fault Cause

2.1Insufficient running storage: The recycling from the running applications will occupy CPU, resulting in the insufficient running storage;
2.2 Underclocking from heating： To increase the system stability in high-heat environments,  the CPU will be underlocked, resulting in the insufficient running storage;
2.3 System abnormity: The abnormal system or the third-party Application leads to the high CPU occupancy;
2.4 Slow response with ANR application：there will be a period of time for hanging before no response;
2.5 Being ROOTed: After the phone has been ROOTed, the modified applications cannot apply for running resources.

3.Fault Method

3.1 Hanging/slow response/no response in single application

(1)Please suggest the customer clean the running Apps in the background or restart the phone;
(2)If the application is pre-installed, suggest the customer clean the cache of the App.（Path: [Settings]—[App Management]—[Select the App]—[Storage Usage]—[Clear Data/Cache] ）;
(3)If the application is not pre-installed, suggest the customer uninstall the application;
(4)Confirm whether the phone has been upgraded to the latest version. If not, suggest the customer upgrade the phone to the latest version;
(5)Suggest the customer backup all the data in the phone and reset the phone;
(6)If the problem cannot be solved, suggest the customer bring the Purchase Invoice, Warranty Card and the phone to the nearest OPPO customer service center for further detection and repair;
(7)After receiving the faulty phone, the service center firstly handles the fault according to the above steps; if the fault still recurs, flash the phone for the customer;
(8)Kindly suggest the customer do not use the application and submit the feedback to OPPO HQ in China; 

3.2 System lagging /slow response

(1)Please suggest the customer clean the running Apps in the background or restart the phone;
(2)Suggest the customer clean up the data/cache in the Phone Manager;
(3)If the phone has been ROOTed before, suggest the customer bring the Purchase Invoice, Warranty Card and the phone to the nearest OPPO customer service center for further detection and repair;
(4)If SD card has been installed, suggest the customer take out the SD card;
(5)If the wallpaper application from the third-party has been installed, suggest the customer use the wallpaper in the Settings;
(6)Confirm whether the phone has been upgraded to the latest version. If not, suggest the customer upgrade the phone to the latest version;
(7Suggest the customer backup all the data in the phone and reset the phone;
(8)If the problem cannot be solved, suggest the customer bring the Purchase Invoice, Warranty Card and the phone to the nearest OPPO customer service center for further detection and repair;
(9)After receiving the faulty phone, the service center firstly handles the fault according to the above steps; if the fault still recurs, flash the phone for the customer;
(10)Test the screen unit（Path:[Input *#899# in the dialing interface]—[Engineer Mode]—[Manual Test]—[Screen Unit Test]）;
(11)If the fault still cannot be solved after flashing, please replace the mainboard for the customer.