When I play the trombone I get a really weird buzzing sound. I just started oplayuing last year. Any tips?

I got a really nice Trombone, it was great, but every once in a while it buzzes next to my left ear when I play it, I don't know why, it goes on and off so for like a week it never happens and the next week it happens a lot. It typically happens when I play a high D. I'm not sure but it might be caused by a loose connector kinda vibrating against the metal.
apparently it happens to french horns all the time, sometimes if you can find where it is, you can stop it with a piece of cloth or something

Hi

Loose solder joint or loose rotor fitting if it's a trigger. I'm sure you can send it out to a shop and they can resolder the joints for cheap.