A7 was much better in Android 8.0 Oreo..no lags,battery drains Not quickly,Charging speed is also better,No lag seen During Gamingis also......Isiliye Saare Tech Youtubers Xiaomi aur others Company ka name lete nhi thakte.
Samsung will fix it in next Ota's brother even iOS has major lag and battery issues after Major os upgrades thats how things works . Dont worry brother it will be fixed in coming months. I also have A7 2018.
