Share your experience!
Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
Do you experience the same thing when you boot your phone into safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
In safe mode,they should be decimated(only default load).After that,they should be fine if you restart.
Force restart your device(power button+vol up until the phone vibrates).
How sure are you that you are booting in normal mode?Could be that your volume down is pressed all the time?
Boot it again in safe mode and turn it off normally.Turn it on after.If this does not help,you might need to either try a repair of the software or visit a sony service for more assistance.