its a common problem on the jazz. i had the same problem with my previous jazz. got a manual now XD. fixed it by doing a CVT flush at home, which cost me $190 (8L of fluid). I got a quote from a local dealer of $260, and $330 at another one. I remember being told that CVT change fixed the problem most of the time.

it just gets louder over time. i don't know what happens after that XD. i didn't want anything to break so i fixed it asap.