Xperia P switch offs and on continuosly till battery last

[kn]

Yesterday i did factory rest in my xperia p, and today m regreating! Because my cell remain on only for 10 to 20s and switchoffs but again switchesOn automatically!!!! this pattern continues till the battery is empty plz help!!!!

[Thommo]

Try to perform a system repair as it sounds like you've had a bad reset

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)

Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP