Screen turns black when telephoning

When I use the fairphone to telephone the screen turns black when I put it to the ear. This is ok and when I got the phone the screen lit up again when taking the phone from the ear again.
Now the screen stays black and I’m not able to end the call if there is no answer.

A post was merged into an existing topic: FP2 Screen can’t be reactivated during/after calls - See first post for Workarounds