Same here. Recently the camera has started shaking really badly so I'm thinking of finally getting a replacement. I have other cameras though, so the phone camera is just for convenience. It's hard to bite the bullet on a new phone when the one I have is (aside from the camera) in great shape.
I'd still be using my 6S+ if this hadn't happened to me. Apparently there's a software problem with the optical stabilization, and it goes haywire. A fix is to override the stabilization solenoids with a magnet next to the lens. Not happy that Apple never fixed this bug they introduced.
The other thing that went wrong, also apparently in an OS update, is that TouchID won't work anymore. The hardware isn't recognized.
I looked into it a bit, and found that this happens when a piece of dust gets into the lens, which steals the focusing of the camera, so it shakes because it oscillates focus from the field of view and the piece of dust. Sadly the camera module needs to be replaced, which can be purchased cheaply but medium tedious difficulty to replace - or pay to have it done not as cheaply.
