Lose Sound Preference after restart

After a restart my Mac Pro always reverts to the built in speaker. I have to go into the sound pref to change back to the external speakers. And Idea why?

I'd love an answer to this, I've had this problem for a while now

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    Bernie Hawaii wrote:
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    Therefore, I only rarely shut down now, to avoid my Groundhog's Day syndrome.
    This is annoying. Help Me. Someone. Please.
    Here’s hoping for an UNGroundhog’s Day.

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