Am besten du wendest dich an den Support: https://fairphone.zendesk.com/hc/en-us (ganz unten sind Kontakdetails)
Für mich hört es sich auch so an dass das Modul defekt wäre. Scheinbar war es bei ein paar vereinzelten Geräten defekt, wie man auch in diesem Thread sieht:
Just when I got my phone (this Monday) I noticed that my rear camera doesn’t work all. When I open the built in camera app (Google camera) it says “can’t connect to the camera” and it ask me to close and or report issue. Then when I tried to use another camera app, Open camera, or something like Snapchat I realized that I can use the front camera without issue in both apps. When I then try to switch to the rear camera the picture from the front camera freezes or the picture turns black. There is…