The "Camera failure" error is not new to Samsung as its handsets were being hit by such camera-related bugs quite often in the past. Now, the time has come for those who own the high-end Galaxy Note 9 and Galaxy S9 to bump into this issue as well. The bug seems to appear only when shooting in Night mode.
https://www.notebookcheck.net/Camera-failed-Note-9-and-Galaxy-S9-users-face-a-new-software-bug.427250.0.html