Hi
If it’s a violent noise I ***Strongly*** suggest that you stop using it right now as it could be a sign of a failing or bad magnetron
The magnetron is the bit that makes the loud buzzing noise and also cooks the food inside but blasting it with extremly powerful microwaves
Humans don’t usually react well to the microwaves from these microwaves
It could also be a bad transformer but they rarely fail in this way
Hopefully this helps
Any questions please ask
Thanks:-)