It looks like Sony Xperia phones are experiment devices to test new smartphone cameras that are going to be fixed and sold to other mobile phone manufactures. I have no doubt. Sony is making money that way. I think we have to wait for Android P update and pray this will be fixed. I don't expect they fix it in Oreo.
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I received brand new XZ1C today (Build: 47.1.A.12.119) - SV/CS/PL distribution. I was trying to enable Wifi on first run to configure my google account, but it has failed every time i tried. So i inserted SIM card in order to download system updates and applications using mobile data. I was hoping that updates will fix that wi-fi problem, but i was wrong. I had similar situation in the past, when i could't connect to wi-fi or it worked very slow on Asus tablet (Android 6). After upgrade to Android 7 problem was solved. Now, the device build is: 47.1.A.12.179 and problem still exists. Wi-fi changes the state: "Connected", "Connected, no internet" etc. When it uses state "Connected" there is a huge lag when i try to download something or even open simple webpage. It is totally useless. I have tested wifi network bandwitch at the same time using Speedtest app on XZ1C and Nexus4 (which was to be replaced) and "Jitter" value is very high every time i'm trying test XZ1C. I thought that Sony provides fixes for all problems, but i'm totally destroyed now, reading this thread :/
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