Hi remoo,
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If the software repair, I suggest removing the SIM card and SD card to see if the restarting stops, as this is not always related to software but sometimes SIM cards and SD cards.
Failing all options supplied, I then suggest you get the handset to a service agent. I have supplied Sony Mobile Customer Care contact information in the below link.
Contact US
I apologize for any inconvenience this may cause.
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