Hey, i can't quite find my problem on the Internet. My note 4 proximity sensor hasn't worked correctly since it's purchase. I thought at first that it didn't work at all during in call situations and voicemail, but come to find if i hold my thumb against the sensor then, expose it to extremely bright light (like right up to a 100w bulb) it will work most of the time. The sensor is clean and unobstructed, so it leads me to believe that the sensitivity is set wildly too low... does anyone have any input that could help?