Share your experience!
Hello sony forum, i have quesiton how fix this problem. I try restart device, go to setings-> app-> all and force stoped messages, disable/enable, clear cash but not help... Please help me. Thanks!
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).
Hm.. thank you! But have others solution for this, i not want lose my apps
..
You could try safe mode first:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Tnx. I try this 
Not help with safe mode same problem 
In this case,I am sorry but if you don't want to try a software repair,you need to let a sony service handle the device.
Hm..oke.. maybe i need repair system software .. thank you so much!
If you try it,keep us updated.
Oke 