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I'm using the build number A2017UV1.1.0B19 build. Each time I restart my phone, my dual sim setting will be reset. I don't have sim card changes but but the phone will not keep my previous default calling setting. The phone may restart by overload caused overheat. It became a problem when it happen sometimes.
Another issue is after and Android 7 upgrade, the data signal is not stable as before although the phone signal is better than 6.x.