Last week at a concert my bari played great in concert band, in the break between concert band and jazz band performances I put it back in the case, when I took it out and put my Runyon metal quantum on for jazz band it would not play A or B in the lower register, it would try to jump to the upper register like the octive key was pressed. I put the stock mouthpiece/reed combination back on and it was better but I still had to control it with air and emboucher. I looked it over and saw no pads that were out of alignment and checked to see if something was in the horn. I bought this horn new in 2000 and has been really great, I presume it is an air leak somewhere, anybody have any ideas? Thanks for the help