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Boot on safe mode, and try to use the internet, see if the phone restarts, if it does then get a brand new SIM card, make sure that it is a MICRO SIM card
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
The phone suddenly keeps restarting with no reason. I am using the phone without sim card jau with wi fi . I tried every thing and restored factory settings but nothing. The only way is to keep it on safe mode
Same here. Xperia home stops working, phone reboots. Nothing helps. Factory reset, no apps installed, no sim card, no SD card.
Sony, is it a conflict with an android update??