Once you’ve reset the app settings on your Android system, restart your device and check for the Android System UI has stopped issue. Fix #7: Install software updates.

If your Android phone has its own dedicated System UI app, you can clear its cache by following these steps: On your Android device, navigate to the Settings app.

It looks like Google is working on a Samsung One UI-inspired redesign of the system settings that moves interface element closer to the thumbs, and you can activate it via an ADB shell command.

Sometimes, outdated apps can interfere with with your system apps and cause issues such as the System UI has stopped problem.