Hi... I've been using Z5 since a 9 mounts now and ni problem faced yet. But recently just before 2 days ago I've updated Z5 to Android Nougat and for the first time 1. Z5 got freezed. 2. Call and dialer app stutters. 3. Some settings in setting menu are taking more time to open than the usual. But on the contrary to other users I am getting a decent battery backup or I'd say somewhat improved backup then the marshmallow.
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