Screen goes black when calling

My FP1 goes black when i’m trying to call. Screen and buttons won’t work and i can’t hear anything from it. Person who i’m trying to call hears me when i call and he/she hears me when calling for me. But again, if i answer the phone, it goes black and i cant hear a thing and buttons wont work.
And when call ends, phone works again.
Have anyone else had this kind of problem? What i should do?

The forum search gives me 50+ results for black screen call. Please try to find a solution in one of those topics.

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