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does this problem show when you are in safe mode? /t5/FAQ/How-to-boot-your-phone-into-safe-mode/td-p/348008
try to insert your sim2 to the sim1. does it happen?
is your apn and network settings correct? try to set your network type to the strongest signal you have in your area.
try to repair your phone using PCC http://support.sonymobile.com/gb/tools/pc-companion/
does this problem show when you are in safe mode? /t5/FAQ/How-to-boot-your-phone-into-safe-mode/td-p/348008
try to insert your sim2 to the sim1. does it happen?
is your apn and network settings correct? try to set your network type to the strongest signal you have in your area.
try to repair your phone using PCC http://support.sonymobile.com/gb/tools/pc-companion/