Xperia L Turning on and off

[Totu22]

I resetted my phone in the morning and after a little later on it keeps turning on and off itself .What can I do??

[discretion1]

Try safe mode: http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008

If you installed any app recently, uninstall it and reboot. If nothing works, you may have to repair the phone using Sony Update Service.