Screen dark when called - sensor seems to be ok

Help Fairphone 2
1

I have a FP2, Android 6.01, SecurityPatch 01.02.2018, Kernel Date 11.04.2018

For about a week the screen of my phone is black when an incoming call happens. So I cannot accept the call.
I triggered via “Maintenance” the proximity sensor (several times) - but with no success. I installed a special application to give me the output of that sensor and I get two values: 0cm (when covering the sensor) and 5cm (when not covering the sensor).

Any idea what to do ?

2

A post was merged into an existing topic: Black screen for incoming calls