A best-before date addresses quality and does not diagnose an appliance. Food age, packaging and product instructions need to be considered separately from a temperature complaint.
What the observation tells you
A stale or changed product may prompt a sensible check, but it is not a thermometer. Equally, a date still in the future does not make a warm fridge acceptable. Use-by and best-before wording have different meanings, so read the actual label instead of treating every printed date alike.
A useful next step
Check the fridge with an appropriate thermometer and keep the packaging information. Describe any wider pattern across items, rather than naming one old product as proof of a failed part.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.