I have the same issue I even uninstalled snap chat and had my camera replaced under my warranty and did a factory reset and nothing has helped I still have the same issue of the camera failing and it doesn't focus when it does decide to work
I got the same problem, it used to happen when I set the ratio to something different than 3:4. I kept it like that for about a week before going back to Full. No more problems
HEY GUYS WAT I DID IS TO CLEAR CACHE OF PHONE THEN RESET PHONE WIPE FROM PHONE BACK UP PHONE BEFORE RESET PHONE THEN WEN IT FINISHED I GOT MY PRO MODE TO WORK WOW ON ONE UI SAMSUNG RECOMMENDED TO EVERYONE TO DO DAT WEN U GET BIG UPDATE LIKE ONE UI TRY IT TELL ME HOW IT GOSE MY BATTERY WORKS JUST LIKE BEFORE GETTING ONE UI UPDATE..TRY IT GUYS LOVE IT NOTE 9 I HAVE.