Different starting temperatures, package sizes and compartment conditions mean the whole appliance does not warm uniformly. Assessing one item cannot establish the history of the rest.
What the observation tells you
A small chilled portion may change more quickly than a large frozen joint. Door openings can affect one section more than the other. The unit restarting later does not erase those differences or make all food safe again.
A useful next step
Record what is known about the outage and consult official guidance separately for chilled and frozen products. Do not use taste or smell to settle uncertain safety questions.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.