A basket resting incorrectly on its supports can transmit vibration. Check the intended hanging position while it is safely unloaded rather than wedging it in place.
What the observation tells you
The sound may change as food shifts, which can make it seem intermittent. A bent handle or damaged support needs proper attention; extra weight is not a repair. Do not reach near concealed machinery to compare the noise.
A useful next step
Refit only permitted components as instructed. If the rattle remains with fittings correctly positioned, record the pattern and any cooling change for assessment.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.