The issue is mysterious in that there’s no apparent cause, but some users have encountered a “camera failure” error message which, like the Xbox 360′s dreaded Ring of Death, means that something’s afoot under the hood. In the case of the Galaxy S5, the popup signifies the permanent disablement of the camera hardware, and the only way you’re going to enjoy the use of the device’s wondrous rear-facing snapper once again is to get a replacement.
The official response from Samsung is as follows:
Samsung is committed to providing the best experience for customers. We have learned that a limited number of Galaxy S 5 devices may have an issue that causes “Camera Failure” pop-up error message. We ask that customers affected call 1-888-987-4357 or visit their carrier for service under Samsung’s standard limited warranty.Source: Verizon Wireless [Twitter]