Yamaha YRB 302 B II Bass Recorder

I bought the Yamaha bass recorder after reading many positive reviews. Unfortunately my experience with this instrument is different. The biggest problem is that the recorder starts clogging up almost immediately and after five minutes becomes unplayable. Even blowing the condensation out doesn't improve the sound. Another complaint I have is that the high B sounds awful. There is a very airy sound and a lot of overtones. The low B is a bit sharp and also doesn't have a pure sound. It's really a shame because without these problems it would be a lovely instrument, because the sound of the other notes is very nice. Also note that the fingering of the low E flat is not as indicated in the instructions that come with the manual; it is 013 rather than 0134.