sony Xperia z keeps shutting down

[some1one1]

so my phone is having a pretty unusual problem..
it was suddenly shutting down from time to time when opening apps etc. 

yesterday, doing an update,  when it finished optimizing applications , it shut down after some seconds
I opened it up again , did the updates again ,got the welcome screen and shut down again after a few seconds

I did this again and again with no luck, then i did hard reset through pc companion 

Now when it opens it goes on with the same optimizing android applications and when it finishes it shuts down problem

ANY advice , greatly appreciated

[Uliwooly]

@some1one1

Do you experience the same without the SIM and SD cards? 

if you do, repair the phone with PCC

PC Companion (PCC)

Bridge (for Mac)

Xperia Companion (XC)

Software Repair Guide

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

[some1one1 · Accepted solution]

thank you for the reply,

i solved it by resetting it as a c6602 (it was originally c6603) 

[krishnasanky]

My Xperia z phone suddenly shutdown unexpectedly. after i restart it shows starting application optimizing apps.. after 25 apps it shutdown. until i plugin a charger it doesnot boot fully.. and again it shutdown after few minutes.. when i restats the battery percent reduce to 20 % from 90 . after it suddenly rises to something above 60 .. after restarts drops to 1%.   3 weeks before i upgraded to lollipop 5.1 on sony service centre itself.  I dont know what is resetting it to sony c6602 .. .and ur solution can get you

[krishnasanky]

what sony authorised service centre staff member said is It is the case of defective battery. But they are charging much around 4000rs. It is not affordable... my phone is 1.5yrs old. lags warranty

[Samantha_Ford27]

hi, just wondering what does the numbers mean? cause my phone keeps shutting off and I don't know why, I need help please

[Zina99]

I an having tha same problem with my Xperia Z3  my phone is only 4 months old and now it keeps shutting down and turning back on and the battery keeps changing few minutes ago it was 4% and the minute I plugged it it started charging and then it went all the way to 100%  what should I do   

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[MArco81]

My Xperia z5 keep shutting down after a few seconds. At first i tought the battery was too low to turn on. And i charged the phone for a few hours. Then the phone got into a loop after the screen of Sony / Xperia. I tried to press power button along with volume up. And it alowed the phone to start. But after a few seconds and when the phone looked like it will work it shut down and vibrates 3 times.

I already tried a repair with Xperia Companion and while i tought it might work after the process completed it failed again. What should i do?

Thep phone is still in warranty!

[graon85]

My xeperia z keeps swithcing itself off Help please

[Tinhead58]

What is c66-----