my Xperia e4 turn off when lock my phone

[thexperier]

I have a problem with my Xperia e4. When i lock my phone, it turn off automaticaly. Please help me with my problem. Thanks

[Phy]

Boot in safe mode and see if you experience the same issue.

How to boot on safe mode
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

How to boot on safe mode on Lollipop

1. press and hold the power key
2. once you get the pop up menu 
3. press and hold "power off" 
4. Boot on safe mode should become available

[Phy]

You can also repair the phone with
Sony Xperia Companion and check if it no longer turns off when you lock the phone.

http://support.sonymobile.com/global-en/tools/xperia-companion/

[Uliwooly]

@thexperier

Do you experience the same without the SIM and SD cards?