I have also begun having these issues. I cleared the cache on my camera this weekend after being prompted to do so by the Samsung health checkup app to aid storage concerns. (I have no concerns- there is more than double the space left empty than I am currently using.) The next time I used the front facing camera it had these lines which resemble an mp3 sound line across the top fifth of the screen. Did anyone get a resolution? I tried clearing the cache again. I force stopped the camera app, tried other apps that also use the front camera, and even did a hard reset. None of these trouble shooting steps solved the issue.
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