A clear sequence helps distinguish an actual changing pattern from measurements taken under different conditions. Record what happened in each compartment and when.
What the observation tells you
Different loads, door openings and instrument positions can create apparent alternation. A shared control or airflow issue is also possible on some designs, but should not be asserted without assessment. Constant setting changes make the sequence harder to interpret.
A useful next step
Keep a simple paired log under ordinary use and preserve warnings. Protect food promptly when conditions are unsuitable. Do not prolong unsafe storage merely to complete a detailed experiment.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.