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try to perform a software repair using xperia companion
Hi @Pemkim,
Welcome to the community!
I'm so sorry to hear about your Xperia XZ.
Is it just the top part of the display that isn't working? If that is the case I would advise you to test the touchscreen in your device, something that is done under Settings > About phone > Diagnostics > Test > Touchscreen. You will here be prompted to clear the "mist" from the display. Are you able to clear the top part in the test?
If the top part of the display responds to touch and it's just notifications that do not work, was it after something specific that this started? Is there any change if you reboot your phone to safe mode? That way we can rule out one of your downloaded apps being behind this.
Let me know how it goes!