Do you sometimes talk with an accent, but not always?

Both my father and I lived in Missouri (pronounced Missourah) while going to college. He spent 4 years there in the 80’s, while I only lived there for the first semester and a half of freshman year (in 2020-2021). Both he and I drawl (speak with a “southern” accent) occasionally, but our normal accent is Pacific Northwestern. Is this a thing that happens, exclusive to the southern Midwest, exclusive to Missouri, or is it lead exposure, seeing as we lived in the same house with the same pipes?
Do you sometimes talk with an accent, but not always?
That happens
Only the Midwest
Only Missouri
Go see a doctor, you have drain bamage.
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Do you sometimes talk with an accent, but not always?
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