Just noticed this today - I don't take many selfies - but the picture is all messed up...like a like in the middle of the screen and the picture twice. The top one blurry and the bottom one faded. Even the AT&T guy had no suggestions other than to get in touch with Samsung!
Thank you for reaching out. I would be happy to assist you further. Do you experience these symptoms if you test your device in safe mode? Have you tried wiping the cache partition on your device?