So that is my thinking now ..... Why is it that Many many many insects can live through winter and survive the elements but yet a strong hive can fail....
and i know people are thinking MItes and other issues but really why dont they flies have mites ??
i think the answer lies in researching other insects and see if there is something they do or have (nutrition and etc) that the bees are not getting

im not saying this is the cure but rather food for thought