This was the week hive. In the spring and summer the hive was very active and seemed to be healthy.
I checked it for mites and it was below the threshold. I did have 2 hives in the bee yard that had mites and I treated all if the hives in case of drifting (where bees go into the wrong hive).
Have no clue as to why they did not survive. Bees being bees, I guess.