Why is my phone getting bright and then dim?

Episode 1586 (1:28:19)

Jason from Indianapolis, IN
Samsung Note 8

Jason updated his Samsung Note 8 recently and now his display is reacting strangely as it gets super bright, then super dim, and then bright again. Leo suspects the proximity sensor may be out of wack, or Jason is holding the phone wrong and covering it up. Try turning off auto brightness as this will prevent it from constantly adjusting the brightness on your phone. But it could be a failing proximity sensor as well, which if that is the case, see if Samsung is able to fix it.