Loose containers or stored utensils touching the appliance or pipework can transmit sound. Check accessible cabinet contents with the disposer off, without moving the appliance or any connected fittings.
What the observation tells you
Remove ordinary loose objects that rest against the body, control box or pipes. Do not hold a hand against the motor while it runs to see whether vibration stops. If the cabinet itself contacts the appliance, that needs an installation or mounting assessment rather than padding forced into the gap.
A useful next step
After a simple storage correction, persistent new noise still deserves attention. Report any movement, leak or grinding change along with the sound.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.