Not working back button (SK17i)

[gcs94]

Guys please try this...
Tap your back button repeatedly and see if the back button will continue to respond cause mine didn't
I don't know it is the work of SE staff but I need to put the phone to sleep before I can use the back button again
but it only works for awhile... Sometimes it doesn't work at all...

[#2]

Can you try to perform a software/firmware repair using PC Companion to see if it helps.

Connect your phone to the PC via the USB cable

The repair option on PC Companion (Support Zone --> Update --> Repair).

Please backup your phone data and settings before proceeding.

[#3]

If that did not work, can you try the SE Update service

http://dl-www.sonyericsson.com/cws/download/1/110/61/1317636927/Update_Service_Setup-2.11.10.7.exe

Download, install and launch the update service on the PC. Follow the onscreen prompts.

Please backup your phone data and settings before proceeding.