Hey @hydroje, make sure that the software is up to date and clear the data of the camera: Settings > Apps > Camera > Storage > Clear data. Should this not help, start the phone in Safe Mode to see if a third-party app is causing this: turn your phone off, then back on and when you spot the Samsung logo on the screen, press and hold the Volume Down as soon as the Samsung logo appears. If the error stops, you will need to uninstall your third-party apps one by one until it's fixed. If Safe Mode doesn't help either, then I would recommend a Factory Reset after you back up your data.
