Shrinkage can involve the textile's permitted treatment, load and chosen programme. The programme name and target help describe what the garment actually experienced.
Understanding this situation
A machine fault is only one possible explanation, and a gentle-sounding setting may still be unsuitable for a particular item. Keep the complete care label rather than relying on the main fabric percentage.
A useful next step
Retain the affected garment and note any previous washing changes. Do not repeat the same treatment on another item as a test. Report abnormal heat or other appliance symptoms separately so they can be assessed appropriately.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.