Hey, I had this same problem on my s6 edge plus, and I upgraded to the note 9 and it's happening again. The fix for both phones for me was to give it a quick shake forward and back. Theres a ti y motor that zooms the camera in and out it seems and it gets stuck, so you gotta force it to go where it is trying to go. I think the problem may have been caused by a minor drop or jar to the phone in order for it to malfunction.
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