The Canon S100 is notorious for generating a lens error without warning. I am an adult photographer who takes good care of my camera. I was walking through a garden one day taking pictures and out of the blue it just suddenly showed a black screen with white letters, with a lens error. After that, no matter how much cleaning or attentive care I gave it, I could not get the lens error to go away. Note that the back of the case is off in this video.