My acoustic guitar makes this weird sound, how could i fix it?

guitar making image

Bryce J

My Ibanez acoustic guitar makes this weird rattly gurgle sound when I play it, but it's only sometimes, NOT 24/7. I never really bothered with it until now because it wasn't consistent, but does anyone know how to fix it? It can do it anywhere, it isn't one specific place.
Oh, and a lot of the time, it makes the sound when two certain frets are played together. its never the same spot though.
and its a guitar, not a bass.

Answer
Let's have a look. There's a marble (Piece of cheese, mouse, both) inside?
Is the neck tight on the body? (THe guitar;s neck)
How about the action? Are the strings clear of the frets?
Perhaps it doesn't like you?

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