Can a planet experience a sudden and dramatic tilt change in its axis which alters weather patterns?

In my fantasy series of ''Diggoran'' ( pronounced Dia-Ran ) Humans initially came from a continent in the northern hemisphere known as ''Atmoran'' which spans 20.561 million square miles. For over 1.9 million years, Atmoran has been a frozen continent which due to the planet's average tilt of 45-60 degrees.

I wanted to create a story of human evolution on Diggoran in which Atmoran was once a warmer, Africa like continent until a sudden tilt change brought about an ice age that forced humans to migrate south across now frozen over oceans.

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Can a planet experience a sudden and dramatic tilt change in its axis which alters weather patterns?

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