Do you have a case installed with a magnet? if so, try removing it.
Have you tried wiping the device cache partition? To do that:
- Turn off the device. This is important as your device won’t boot to Recovery Mode when it’s on.
- Press and hold the Volume Up key and the Bixby / Power key.
- Once the Android Recovery screen comes up, release the buttons.
- Use the Volume Down button until you are highlighting ‘Wipe cache partition.’
- Press the Power button to select ‘Wipe cache partition.’
- Use Volume Down to highlight Yes.
- Press the Power button to confirm the action to clear the cache.
- Wait for a second as the system wipes the cache.
- Press the Power button again to reboot the device. This will return the device to the normal interface.