Buzz sound

[JoaoPinheiro]

I've noticed that my guitar makes a weird buzz sound when I play on certain strings and notes. I've tried muting several parts of the guitar while I play and I found out that the source of the buzzing is the bridge pickup rattling. The buzzing sound goes away if I rest my fingers on the pickup while I play those problematic notes and strings.

Does anyone have any idea of how I might be able to solve this?

Thanks!