Share your experience!
my mobile sony t2 ultra restarts on its own after update to kitkat im facing this problem....
Does the same occur if you remove the SIM?
After a major update like kitkat, it is better to restore the phone to factory default setting. Then start fresh. You can get rid of problems from leftovers
Sorry to hear that you're still having issues with your phone.
Did you also try the suggesting from alexdon? Try removing the SIM card(s) and try other SIM cards. If there's a bad connection with the SIM the phone could restart.
If the issue should still remain I recommend that you contact your local support team.