Problem with Xperia SP Shutting alone

[Palini]

Problem with Xperia SP Shutting alone

Recently bought an Xperia SP, but even this turning off alone, especially when I do a call or send a sms.

Model: C5303
Android: 4.1.2
Kernel: 3.4.0-perf-g128501149-g40c437aBuildUser @ BuildHost))
# 1 SMP PREEMPT Wed Aug 14 17:10:55 2013
Version: 12.0.A.2.254

Thanks for Help

[Uliwooly]

The issue could be an app acting up or a faulty SIM card 

Repair your phone with 

Update Service (SUS)

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

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