Need some advice here. I have a few hives that have started/died off. I found that there were larvae (capped) in cells that did not hatch and even some bees that were fully formed and did not make it out of their cells (you see their faces pointing out from the cells). No stores left and no more brood. Can't find queens either. This happened from my strongest hive (I am a hobbyist). I had made splits earlier this year. One split (earliest this year) seems to be doing fine. Original hive and 2 other splits are pretty much gone.
Any help would be appreciated.