Xperia Z frozen when the screen is locked

[sambica]

Hi there!
My Xperia Z freezes frequently when the screen is locked and the only possibility is to hold the volume button and the power button at the same time and it would shut down and restart itself. In the past three days that happened to me 5 times. When it'f frozen the music that was playing would continue to play, but I wouldn't be able to do anything else. Thanks for help!

[_alexdon_]

Can you check if the same occurs in safe mode?

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

[sambica]

I tried that, everything is the same...

[_alexdon_]

You may need 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).