1. If the problem occurs after the mobile phone is dropped or liquid enters, please bring the purchase invoice, warranty card and mobile phone to the official service center of OPPO for testing and handling.
I suggest you cut a picture and send it to your friends. If the picture is normal when a friend sees it, there may be something wrong with your mobile phone. I suggest you go to the nearest OPPO official service center for testing and handling. If both sides have problems, I suggest you clean up the background data and re-enter it to see if it is normal.
3. It is recommended that you update the version of your mobile phone system to the latest.
4. If this problem occurs when using a single software, it is recommended that you update the software version, clean up the application data of the software (note that this operation will lead to data loss), or uninstall the software and download and install it again.
5. If this problem occurs when using multiple softwares, it is recommended that you restart your mobile phone.
If the above methods can't solve your problem, I suggest you bring your mobile phone and purchase certificate to the official service center of OPPO for testing by professional engineers.