Update

[DAVE631]

Since my update my phone restarts sometimes when I try to make or receive calls, can any one please help with this? Thanks

[Thommo]

Try performing a system repair using PC Companion as this will often fix issues - This will factory reset your phone and erase all data so best to backup before you begin

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP

[Jake-SonyXperia]

Hi DAVE631,

Welcome to the community,

You may also want to try a simple removal of the SIM card for around 30 seconds and out it back in again. Make sure the handset is turned off when performing this task.

Sometimes an issue such as this can be resolved with basic troubleshooting.

I hope this helps.