Ok so Ive been casually playing trombone for like 10 years so forgive me if my music theory is off (in terms of how high pitch this is) but Ive found that my trombone rattles when I hit the range of A4 and C5 (I believe thats the case. Ive played sliiightly higher without the rattling happening but its hard to test since thats the very far reaches of my range). What could be the cause of this? Is this common with student grade trombones? I cant imagine damage to the instrument would affect specifically this note range and nothing else. It could be that Im simply an intermediate player that is having a hard time hitting these notes, lmk what you think :)