Sony Xperia Z (C6603) i dont know why my XZ be like this .

[Syafique]

All was okay , its all started when i sign-in google account using wi-fi and entered the google play store , the screen starts flickering and duplicating top screen , i only happens in the centre homescreen and lockscreen . if somebody have some solutions , please do tell me . 

[Thommo]

Sorry to hear this but you could try a system repair - See below

Performing a system repair using PC Companion will often fix issues - This will factory reset your phone and erase all data so best to backup before you begin

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP