Bottom buttons does not work

[pillertrillare]

Suddenly, the buttons on bottom of screen doesn't work. Back, Home and Active apps.

I've downloaded the latest software but that didn't help at all. The strange thing is that it works sometime, maybe every 20time I unlock the screen.

I think the problem started when some apps were updated. How can I restore the settings to the latest point of a working phone?

[Thommo]

Try Settings then Apps then tap the 3 dots then Reset app preferences - Reboot and test

[pillertrillare]

No, sorry, it didn't work. What do you mean with "reboot", can I do anything other than turn the phone off and then on again?

[_alexdon_]

Can you check how it is in safe mode?

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

[pillertrillare]

Ok, I turned the phone into safe mode, but the problem remains. Could it really be a hardware issue?

[Phy]

That seems to be a hardware issue, contact Sony Xperia Support 

http://support.sonymobile.com/global-en/contactUs/

[_alexdon_]

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@Phy wrote:
That seems to be a hardware issue, contact Sony Xperia Support 

http://support.sonymobile.com/global-en/contactUs/

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Before you send the device into service,you may want 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).

[Uliwooly]

Don't forget to backup

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355