I have the same one and I don't know if it's just my device that's defective. First of all, it lags a lot and when I enter an app, exit, and then reopen it from the screen with all the open apps, the little bar at the bottom, the app "restarts" and whatever was left starts from the beginning. Also, something else very serious that has bothered me is that on every network I connect to, it connects normally but nothing works—neither Chrome, nor YouTube, nor Viber, and generally apps that need internet. However, when I turn on mobile data, the internet works for a while and then after a bit it cuts off and I have to reconnect to a regular network. Finally, one day, notifications suddenly stopped appearing on the lock screen and I couldn't change this setting from the settings. Also, the camera is of terrible quality. Thank you