Hi, welcome The advice in the above posts is good. The most obvious thing to check first is that the strings are at the right tension: in other words are they in tune! String tension and truss rod tension work together to ensure that there is the proper gap between strings and frets. That's why truss rod tension may need adjustment when new strings are put on. It may well be that the neck is too straight and a tiny adjustment to loosen the truss rod slightly may do the trick. Retune the strings after you do this. It could possibly be that the saddle height is too low (action height) although most manufacturers would set that a little high to avoid buzz. Same thing with nut slots; I've actually lowered the nut slots on all my HB basses, manufacturers err on the side of caution. If it's none of the above get in touch with Thomann customer service. They are excellent and will give you advice on what to do which may well be to return it in which case they will then sell it as a Deko. Alternatively, depending on where in the world you are, it may be more economical for you to take it to your local guitar tech. Don't give up on HB, they are excellent value for money but just like any other manufacturers in the world very occasionally a faulty one will get out.