Welcome to GM-Trucks forum! As a former Duramax 2500 owner (2004 & 2014) it does sounds as though you may have a bad battery. Did you have both batteries load tested? Yes, it is recommended to replace both of them at the same time.
In addition to the above, why not just call Crutchfield and ask them?
Same for me, been working perfectly as designed for 4+ months now.
Love that color! We need some pics when you get the time.
Congrats & enjoy your new purchase!
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