Distinguished SOTW Member, Forum Contributor 2017
I agree - it happens to me too sometimes. I'm sure the mouthpiece doesn't change though and since I use synthetics, the reed doesn't either so the only variable is me. I was just taking in too much MPC whenever I got 'pinched'. The difficult part was realizing what was going on because it happened so infrequently - and never while practicing.I'm a longtime player, and I still get this problem occasionally, so it's not a "newbie" problem.
The solution of course was quite simple - don't do that. ("Doc - it hurts when I hold my arm like this...)
Since the curve on MPC facings can be quite different it leads me to believe that a different MPC could be an easy fix as well. In my case however - its just sloppy playing.