Hi,
I would suggest checking your gear shift button to see if it is getting stuck when you shift to park. If this button does not release when you shift to park then the BCM does not allow the key to release because it doesn't know that you are locked in park. If that button is pressed then you can shift out of park inadvertently.
Here are a couple home made videos of people who have discovered this:
https://youtu.be/FXeOK7k4HCU
https://youtu.be/tXJfJwcWhf0
The actual repair would be to replace this shifter assembly because they don't have many parts that would repair this issue.
Let me know if you have questions.
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Friday, September 27th, 2019 AT 3:10 PM