I can´t turn off my phone

I have a strange problem.
I can't turn it off without it initiating a boot loop all on its own. Every time I press the power button and select "Power Off", it turns off and then about 5 seconds later the Sony screen comes back on, stays on for a few seconds, turns back off and repeats. I can break the bootloop by holding the power button for about 10 seconds and turning the device back on. The consecuence is that every time I turn off my phone, it discharges totally!
My phone is NOT rooted and it hasn't been modified in any way.
Compilation number 23.0.1.A.0.167
Kernel 3.4.0-perf-gd4d661a BuildUser@BuildHost #1
Baseband 8974-AAAAANPZQ-00027-12
The issue appered after a few months of use, in November. I think it didn't coincide with any software update.
It's not a brand new phone so I wouldn't like to  return it as I already have lots of information in there. 
Thank you for helping.

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).
All we have to decide is what to do with the time that is given to us - J.R.R. Tolkien

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