I have dry cereal with milk for breakfast almost every day. I keep the milk well refrigerated and pay close attention to the expiration date. This year, however, I have had to dispose of more spoiled milk than any time in the past.
I think the explanation relates to the hot weather. Milk carriers make deliveries early in the morning, before the supermarket employees report to work. The overheated milk begins to spoil in the hot sun and, as a consequence, does not make it to the stated expiration date.
Despite my complaints to involved parties, no one seems to really care. Customer service failed again. When I return the milk for a refund, it is treated as an annoyance, not a call to action.