The main job of the Accelerometer Sensor in a Samsung device is to tell Android OS whether the screen should be in Portrait or Landscape mode. It also makes sure that the photos on your device are lined up right and not tilted or off-center. This feature can be turned on by the user or by an app, such as when watching Netflix (which automatically changes the orientation to Landscape).
If auto-rotate suddenly stopped working on your Samsung device, it could be because of an app problem, a software glitch, a firmware error, or a bad sensor. Even though this isn't always the case, it could be because the device's Accelerometer Sensor is broken.

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