A wide assortment of things. The OS itself chews a nice chunk beings it runs nonstop. If you have biometrics enabled it will, AOD,alarms, edge lighting, Many system apps use ram many times a day. Automatic updates, AR, Carrier Apps I disable all my carrier apps. Also cut down on what apps can run in the background. I always have around 1.3 to 1.5 free at any given time.
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