Use clear opening dates and agreed storage areas so a changed item is not automatically blamed on the fridge. Different users may otherwise describe different products and times as one incident.
What the observation tells you
One person might adjust the control while another adds shopping or leaves the door open. A short shared note about unusual events is more informative than conflicting recollections. Keep raw and ready-to-eat foods appropriately separated, regardless of whose shelf they occupy.
A useful next step
Agree who checks the temperature and where the thermometer stays. Record any setting change and tell other users when cooling is unreliable. Personal shelf ownership does not override safe storage or the need to avoid obstructed vents.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.