During the past six months to a year, I've noticed a change in my clarinet tone and I'm also sounding very flat. I've played for around 30 years and have a relatively new Buffet RC with a B45 mouthpiece. I use Vandoren classic reeds strength 3, however I've also been using Legere European Signature 2.5. These sound fine for around a week or so and I liked how easy they were to play, but they seem to sound tinny, shrill and flat after not that long. They're too expensive to last less than a month with light use so I'm not going to buy any more. I practice regularly but feel despondent as my playing years ago was much better than it is now and I can't understand why. Clarinet is one of the instruments I teach, and I'm feeling less than confident demonstrating in front of my students due to these issues. Is this a common thing to happen as one gets older? I get jaw pain on the right hand side too, which I've never had before.
Any thoughts on why my tone sounds so bad please?! Is it the clarinet or me? When I bought the clarinet and mouthpiece, my tone was fine. I just don't know what's happened.