Worth noting that most home fridges have no kind of indication that they can't keep up.

Your fridge, rather than being the 5C it should be to keep your meat safe to eat, might have been up at 12C. You wouldn't be aware (it still feels cold), but you'd end up eating possibly dangerous food.

I really wish fridges had an alarm in that case (ie. The fridge has an indicator saying 'too hot. Food is now unsafe to eat').