the display doesn't work when phone is locked

[aquib]

My z3 is abt 6 months old
Recently I locked my phone and tried unlocking it but the screen never turned on though I can see the screen lighting up a bluish colour but the display doesn't appear.
I have to swith off the phone for around half an hour and restart for it to work.
Any idea why

[Phy]

Try repairing your phone with Sony PC Companion

Sony PC Companion.
http://support.sonymobile.com/us/tools/pc-companion/

[Phy]

If PC Companion doesn't work Contact Sony Xperia Support.
http://support.sonymobile.com/global-en/contactUs/

[aquib]

Ok I'll try it thnx mate

[ahmetfx]

Have the same issue and resetting machine did not help.

[VoodooCharlie]

Mine has just gone too. Dropped it in water (covers were closed), and now no display