Mine did the same and this fixed it. But this begs the question, Why did it suddenly switch to Landscape and is it going to keep doing that?
Hey @ajpn, I hope you are having a great day so far. To fix this and place it back in portrait mode, simply follow these steps:
Go to Settings app
Click on Lock screen
Click on Always On Display
Click on Screen Orientation
That should put it back in it's original orientation.
I hope this helps! Have a wonderful rest of your day! :)
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