iPhone 12 Pro - Unknown Part warning for camera

A few weeks ago I was taking photos and set my phone down. When I picked it up and opened the camera the screen was black. Closed app, turned phone off and back on, opened camera again and it seemed fine at first but then I got the unknown part warning. Every time I open the camera now it is in two times zoom but I can tap the 2 and turn it back. Portrait mode cannot be taken out of 2x zoom. This phone has never been repaired, has always been in a good case and has no body damage. I would love to say it's never been dropped but we all know that would be a lie. Over the nearly 2 years I've had it it has been dropped on hard ground maybe a half a dozen times, a couple feet to carpet a dozen or so, but I can't remember the last time it fell so the message isn't the result of a drop. Internet searches have lead me to believe this is a fairly common issue. Anyone know what to do about this?