The installation may require space for airflow and protection from stored items. A blocked route can affect cooling even when the glass surface is clear.
What the observation means
Do not remove panels or reach towards the hob's underside. Items stored too close to a fan or opening may be relevant, but the required arrangement is model specific.
A useful next step
Check the owner's installation information and describe recent storage or cabinet changes. If overheating warnings occur, stop and allow the prescribed cooling. Have the installation assessed rather than drilling extra holes or removing protective barriers yourself.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.