Some hobs regulate low power in pulses. A changing boil does not by itself establish that the zone is repeatedly failing.
What the observation means
Pan construction, liquid quantity and the selected level influence what you see. A thick base can smooth the effect differently from a light pan.
A useful next step
Check the manual's operating description and use suitable cookware. Record a new change under familiar conditions, especially if accompanied by a warning. Do not test the pattern with an empty pan or interpret every pause in bubbling as a confirmed electronics fault.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.