Reboot the device
First of all, make sure that the problem with your phone's camera is not due to a specific problem. Restart your device and check if the problem is gone or not. If when you restart the phone it has disappeared, you have nothing to worry about, it was an internal failure of the device that sometimes occurs without really knowing why. If the problem continues, you can try the following solution that we give you below.
clean the lens
A clean lens is essential for taking well-focused photos. Having the camera glass covered in fingerprints is a possible cause of your phone not focusing correctly.
Clear camera cache
Application cache is a type of storage where applications store temporary files that they will need often. By saving those files, the next time we use it, it will work faster.
When an application (in this case the camera) tends to malfunction, we choose to uninstall it and reinstall it again. On some occasions it may not be necessary, and the simple fact of clearing the application's cache would suffice.
To delete the cache of the device we will go to the following route: Settings> “Applications and Notifications”> “All applications”> Camera> Storage> “Clear Cache”.
Update apps on Android
It is possible that some app that is not native to the device is giving some kind of error and affects the camera of your device. If this is the case, you can choose to update the apps that you think may be generating this error. Updating them might fix those bugs.
Update apps on Android
To update the applications on an Android device we must go to the Google Play Store and follow the following route:
Menu > “My apps and games” > Update.
Factory reset phone on Android
To restore the factory phone on Android we will follow the following route.
Settings > “Reset Settings” > “Factory reset” > “Erase everything”