Alto Saxophone: Fuzzy Note?

Whenever I play a high A or Bb (not altissimo) the sound is always fuzzy, and I can't seem to find a problem with it. Also, when I cover the octave hole, the sound quality is fine and not fuzzy at all. It is only these 2 notes. I don't want to send it into a shop if I don't have to. Anyone know what's going on?