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Hi @Poppero,
Welcome to the community.
The camera app will be automatically if a newer version is available.
When you are experiencing issues with an app, the first thing I would recommend is to restart your phone, and if the issue still persists, reset the app.
Android 5.1 (Lollipop) or earlier: Settings > Apps > Swipe across to All > Camera > Clear data and force stop.
Android 6.0 (Marshmallow): Settings > Apps > Camera > Storage > Clear data > Back > Force stop.