Since some time ago, every time I lock my phone screen or it gets locked due to not being used, Bluetooth automatically switches on.
Why could it be?
Android 4.4 on a Samsung Grand Neo Plus
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Per the info from Javier Sarten Carranza, a new update to FireChat app is the cause of the issue. The update seems to have introduced the permission to access (and manipulate) Bluetooth settings (android.permission.BLUETOOTH_ADMIN) and since that permission is considered normal it stands to reason why Android wouldn't have sought user's discretion when granting the permission.
Same problem: Turning off screen activating the bluetooth