iPhone 13 Pro Bottom Half of Screen Black

My wife's iPhone 13 pro, which has worked flawlessly since purchased last September without issue, is black on the bottom half of the screen as of this morning. The phone has not been dropped, no water has been spilled on it, nothing that should not happen to a phone physically has happened. It just stopped working when she unlocked it this AM. Although the screen is black, the touch mechanism works. We can unlock the phone using the passcode, and anything that appears in the black portion of the screen can be touched and manipulated as normal. Also, the screen occasionally flickers on the bottom half from black to normal and back.

I am presently backing up the phone. Any advice on how to proceed much appreciated!