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You may need to perform a software repair using PC companion.The process will erase all internal memory.You might need to charge your device for about 1-2 hours before so the device has at least 60% battery.
Make sure the device is not connected to computer or laptop and turned off (sometimes you have to press power button and volume up until the device vibrates 3 times or on some devices you have to press the small button near the SIM tray or on the back of the device).
Open PC companion->support zone->phone/tablet software update->repair my phone/tablet blue highlighted.Follow the steps given,do not connect your phone until prompted to press volume down while plugging USB cable. If PC companion does not start the repair process, you might need to run it in compatibility mode with Windows 7 (in some cases XP).
Jez2110 I also have a device that is suffering from the same symptoms - did the factory reset work or was it a hardware issue in the end? Reluctant to go through the headache of a factory reset if it is unlikely to do anything to help.
I'd be greatful to know how this issue was resolved for you?
Thanks
Rich.
@rich_ni - The difficulty is that there can be a nubmer of reasons for this to happen so whilst the steps above may not resolve some causes it will resolve others. With this said it is worth trying as the other option is to speak with your local Xperia Care team regarding having a repair arranged.