For those who have intermittent camera after a fall/drop: TAKE case off and any accessory such as S pen. Get hair dryer, concentrate on the back top because that's where you will gently pry open with a thin pvc nfc ( or similar) card, guitar pick, or other pry tool. You need to continue applying heat, until your pried enough of the cover up to see and press the camera ribbon cable end down to make sure it's not lose. It doesn't have to be snug to sometimes work. I've done thru that with a Samsung.
Currently, I've a Galaxy Note 9 that's *supposedly* rated highly water resistant and can withstand up to 1-2 minute with NO damage, and to 5min even. Yeah, right!
Mine had a completely sealed Otter Box on and fell into a washing machine that wasn't even full enough for the water to touch the top clothes, which is where it fell. I grabbed it immediately. It whacked out, screen fritzed with colored rainbow lines. Did not even seen more than damp. Want not submerged, is the thing. Now, 2 weeks later, opening the camera does 1 of 3 things: Opens with a black screen then state camera is busy then “bout 4 responding, close app" 2. Opens to black screen and freezes entire phone and causes flashlight to come on and stay on even when it shuts down itself, staying on all night 3. Just stays black.
Tried third party apps, selfie only app worked a few times when Icould force front to work. Now, Im taking this $1k thing apart since Asurion via Verizon does not help in my area and will follow the above directions that I'd already figured out halfway for myself. If possible, I'll update what I find under the hood and try linking to or inserting photos. I think it may be disconnected and wet from the fall.