Blutooth not remaining paired

I just got a new car stereo with GPS, blutooth, all the goodies. The problem, when i get into the car and turn blutooth on on the S8+ it sees the car unit but I have to keep putting the stereo's code in every time. Shouldn't it remember the code? Why do I have to keep putting it in every time? I don't know if it's a problem with the car stereo or the Samsung.

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