This camera by chance, which would currently be available (among other spare parts)? …
Might be trouble with the antenna connectors …
https://forum.fairphone.com/search?q=fp2%20antenna%20connector
To rule out software malfunction and/or to get a fresh start … 🇬🇧 🇩🇪 ✏ Installing the Fairphone 2 from scratch in case of failure / Komplette Neuinstallation des Fairphone 2 im Fehlerfall
Of course it’s always good to see whether there might be anyone locally to help or just to provide additional eyes and an additional mind.