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The lockscreen and home screen must have the same live wallpaper, if you switch the home wallpaper the lock screen will change the wallpaper to a generic Sony wallpaper.
Can you check if the same occurs in safe mode?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
You may need to perform a software repair using PC Companion.The process will erase all internal memory.You might need to charge your device for about 1-2 hours before so the device has at least 60% battery.
Make sure the device is not connected to computer or laptop and turned off (sometimes you have to press power button and volume up until the device vibrates 3 times or on some devices you have to press the small button near the SIM tray or on the back of the device).
Open PC companion->support zone->phone/tablet software update->repair my phone/tablet blue highlighted.Follow the steps given,do not connect your phone until prompted to press volume down while plugging USB cable. If PC companion does not start the repair process, you might need to run it in compatibility mode with Windows 7 (in some cases XP).
I hope this will help.
No problem,take your time.
Finally got some time to play with the PC companion. And it didn't work. Same problem as before.
I do not have Xperia E4 to check,you could record the problem and maybe a staff member will take a look.