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Xperia XZ1 Compact - optimised settings changing automatically

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Xperia XZ1 Compact - optimised settings changing automatically

I have an Xperia XZ1 compact and the phone sends up this message

 

"Optimised settings for your network operator will now be installed and your device will restart"

 

then it proceeds to change over the Mobile Data, Talk and SMS to the other Sim card and restart the phone.

 

it is doing this muliple times a day, which i need to convert back each time and restart the phone.

 

pls advise any solution