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Solved! Go to Solution.
You can use a 3rd party app for contacts. Also, read these:
/t5/Xperia-Z5-Z5-Compact-Z5-Premium/Contacts-stock-app-crashes/td-p/1118398/page/5
/t5/Xperia-Z3/Contacts-not-working-after-latest-update-6-21-2016/td-p/1137122/page/3