Some time ago, I picked up tenor saxophone and I'm learning to play in my (very scarce) free time. Recently, I've noticed that the top A sounds fuzzy compared to other notes. It's quite pronounced. G# and Bb seems to be unaffected. A is the note on which octave pip is changed.
Is this a common problem? Is there something I can do with my technique to remedy this, or might this be a problem with the instrument?