For some reason i cannot figure out in the past three weeks my trumpet playing has changed drastically and i cant figure out how and why. My range used to be a clean G above high C but now with a good sound its a top line F! Ive started getting vibrations from other parts of my lips. A little bit to the left of the mouthpiece rim a part of my lip thats not in my embouchure just recently start vibrating when i go above a top line F. Also I havent change anything in my routine in the past three weeks the only thing that i changed was my mouthpiece from a Bach 3c to Monette B4S. Help?