I have a Kala KA-15S (mahogany laminate) with Aquila Nyglut strings. I've noticed that when I play certain chords -- especially those where all four strings are fretted like B major -- I get a funny buzz/ vibration on either the g string or the A string. Is this something that could be fixed with better strings or a better uke? (Always thinking ahead to the next uke!). Or is this a typical beginner issue?