You can follow the following methods to solve!
1, clean the camera data (Settings > Application Management > Display system processes > Camera > Storage usage > Clear data);
2, turn off the phone and restart it, and then re-observe whether such a situation occurs;
3, if the problem still exists after the restart, it is recommended that you can back up the important data information of the phone and restore the factory Settings;
If the above methods do not solve your problem, please bring the purchase invoice, warranty card and mobile phone to the nearest OPPO customer service center for testing and processing.
Now turn on the camera and click [3] in the upper right corner.
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2. In the pop-up options interface, click [Settings].
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3. Open the Settings screen and tap [Selfie image].
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4. Then select the selfie image as [Off].