Screen turns black with making phonecall and messengerchat

My screen turns black when I make or re ceive a phone call or chat on messenger. When I get an incomming call too. The screen doesn’t react, can’t use speaker or end the call. I have to take my battery out and restart to get screen again…

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Are you running the latest version of the operating system, FP OS 17.05.2? If not, please upgrade to that version and run the proximity sensor calibration tool in Settings -> Maintenance.


Proplem fixed by sensor calibration! Thank you!