Share your experience!
I'm Having the same problem.
I received XZ3 phone as an aniversary Gift from my boyfriend.
After one month it started with application errors, i thought i had to many apps, so i wiped it all.
After that it started rebooting is self, as if a gosht was having fun with my phone.
I contacted sony, they gave me instructions, i followed them. After a week the problem started again.
And on my birthday the phone decided to DIE!!!! 
Once again i contacted sony, the rep said: charge it for 4-8 hours. I DID!!! its still dead!!! 
When ever its connected to a wall charger its indicators light keeps blinking (red) 
But it still doesn't want to turn on. its already been dead for 3days now.
Someone please bring ik back to life

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 80% 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).
Have you followed the steps? Did you charge it and turn it off when you were prompted to connect?
In this case,contact your local sony team:
http://www.sonymobile.com/global-en/support/contact-us/
/t5/FAQ/How-to-get-your-Sony-Xperia-product-repaired/m-p/991374#M21
all i want to do now is cry
@alexdon wrote:In this case,contact your local sony team:
http://www.sonymobile.com/global-en/support/contact-us/
/t5/FAQ/How-to-get-your-Sony-Xperia-product-repaired/m-p/991374#M21
I am really really sorry. Please keep us updated on what you decide to do. Oh, and don't cry. Big girls don't cry. 
@Alexdon
So here is my update.
My phone still doesnt want to switch on!! 
Went to the shop where i purchased my phone, they said it maybe th PCB Board??
Cuz it connects and disconnects it self from the pc.
Any other advices??
I really want my phone back :smileycry::smileycry:
If you did stop by a sony service, why don't you let them repair it?