Default Black Screen after missed call

Hello friends, I've noticed, that my z1c with running .757 firmware gets a black screen after I missed a call.
I can't turn the display on.
I must reboot the phone by pressing vol+up/power buttons.
Can anyone help me to solve the problem?
Best regards, Chris


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Sony Xperia Tablet Z SPG321 LTE - AOKP-KitKat-Nightly ROM
Sony Xperia Z1 Compact - Munjenis Custom Stock Rom - rooted