Zojirushi Bread Maker

I have traced the buzz on my machine to the lid. If I press lightly on the lid, the rattle/buzz goes away. Suggests there is a loose bolt or poorly fitted sub-assembly in that region.

I have the BB-PAC-20 and have the same problem. When the breadmaker goes into kneading mode, a loud buzzing sound starts and it is really really loud. Noticed that lightly pressing the digital display with my thumb the sound stops. I don't have the proper screwdriver that will fit into the screw but will get one to see if the screws have loosened in the three years I've had the machine. In the meantime I take a Pyrex and place it on the display to stop that noise. Unfortunately the warranty expired but the machine works perfectly otherwise. Thank you for your post, it feels good to know that I am not the only one experiencing this.