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The phone used to work good, but a lot of problems after latest update. Phone rebooting all the time. Sone came with apologize and anouncment that the problems were related with walkman application. The rebooting is not so frequent but it happens still. Today I found out that skype is not working. After update I did reset to factory settings, it didn't help.
reboot your phone on safe mode and check if the problems persist, if they don't then it is an app acting up, if they do then repair your phone with SUS or PCC, if that doesn't work then take it to a Sony repair center
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
http://www.sonymobile.com/global-en/support/contact-us/
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I have solved it by resetting again to factory settings. I did it once before but the problems were not solved. I suspect walkman and album applications being cause. Right after resetting I got message to update these two. I rejected it and it still works good. Skype works good also.