Compare like-for-like ordinary use before drawing a conclusion: similar permitted scraps, feeding rate and required water flow. A change in cooking waste or tap performance can alter the experience without identifying a worn motor.
What the observation tells you
Do not compensate by extending every session or adding abrasive materials to sharpen the mechanism. Notice whether water still drains freely and whether noise, smell or stopping has changed at the same time. Stop if any abnormal symptom occurs.
A useful next step
Give the engineer a concise description of the gradual change. Useful operating history helps determine whether the next assessment concerns feeding practice, drainage or the appliance.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.