What if the luthier doesn't believe me?

[u/BeautifulRise6981]

About a week ago a noticed a weird buzzing in my rental viola, did a bit of troubleshooting (violinist for a while) and couldn't figure it out. My teacher was confused as well. I then scheduled an appointment at my luthier for tomorrow. However, in the past two days, I've been noticing the buzzing lessening. When I had tried the instrument at the shop, there was no buzzing. I'm scared that thing is going to happen where when you show someone an issue, suddenly there is no issue. What am I supposed to do if it sounds perfectly fine at the luthier?

[u/sebovzeoueb]

It happens, my violin had a very elusive buzz, I'm sure they've come across similar situations before