Recently I've noticed something. I think my tone might've improved! Well done... Oh. Recently with bands I'min and the Christmas season with being playing a lot of jobs, (due to other commitments I usually end up a little late to miss the warm up) but I feel like my lip is getting properly tired after 3-5 marches or carols. As a result I think my range has dice raced, I could get (just about) a top C (C above Stave) but known its limited to a A, if that It could be a new way I've been playing? (Holding trumpet different and stuff) or what? Any diagnosis? Better tone (I think) but worse endurance- solutions? Sorry for a lack of sense, I'm on my phone!