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I have had this phone a little over 4 months now. In the last 2 months it keeps getting slower and slower until it completely freezes resulting in me having to reset the phone or the phone doing it by itself.
Happened 4 times yesterday.
@Vidmar23 can you try running it in Safe Mode for a while, see if the problem continues could be a 3rd party app causing this. If no luck perhaps a system repair is needed but try Safe Mode first..... Good luck
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
http://support.sonymobile.com/global-en/xperiaz3/tools/xperia-companion/