Before you assume that it is a loose fret try tuning the string down 1/2 tone and see if the dead spot moves up 1 fret. If it does, you do not have a loose fret. What you have in that case is a common occurence in many instruments where the resonant frequency of the body of the instrument is the same as the note you are playing and they tend to cancel each other. That is why the note sounds dead. It is a natural acoustic phenomenon that even some very good instruments have and in fact may be more noticeable on high quality instruments
You cannot change the laws of physics.
If the dead note does not move when you tune down then I would look at the loose fret possibility.
Aaron
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