The truss rod is there to adjust one thing, the neck bow. But if you don't actually LOOK at the truss rod, you will never know if you need to adjust it.
So, to answer you question, yes, it could be MANY other things. And if you are having buzzes at the twelfth fret, it is PROBABLY something else (though I can't say for sure). Get the guitar to a good repair person for a set-up. It is typical for any new guitar (except sometimes with very high end hand built guitars) to need a good set-up. Guitar factories simply can't possibly set-up guitars properly. There are too many things that can go wrong. Take it to a professional and get it done right.
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