Auto Sleep

[Bete]

I've turned my phone to sleep mode after 30s of idle, but it sleeps whatever it wants, neverthless I'm using it. How to fix it?

[Thommo]

Do you have Stamina mode enabled as this could be a factor - If it takes longer than 30seconds then consider an app is keeping your phone awake

[Bete]

No, it takes less then 30s, thats the problem. It goes to sleep mode even if Im using it, for example playing a game.

[Thommo]

Consider performing a system repair as this will often fix issues - This will factory reset your phone

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 onscreen 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

If that fails then you need to either return your device to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/