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Hi, you have a few options.......first run the phone for a little while in Safe Mode, this will see if any 3rd Party Apps that you have installed are affecting your phone (if you have downloaded any that is)....2nd option is to perform a PC Companion repair of your phone, you must however back up your phone before doing this.
I have added the links for you to read over.....good luck :smileysmileywink:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
http://support.sonymobile.com/us/tools/pc-companion/
http://support.sonymobile.com/global-en/tools/bridge-for-mac/ http://talk.sonymobile.com/thread/36355
http://talk.sonymobile.com/t5/FAQ/Backup-amp-Transfer/td-p/407253/jump-to/first-unread-message
This normally happens because the Sim card is faulty or is one that has been cut down to size - I'd remove the Sim card and see if the same happens
That is good news.....& very good service :smileysmileythumbsup: