I'm in northern California and I've noticed a LOT of dead bees in front of the hive, some with pollen in the board in front of the entrance. Like they froze to death. Why are they all in front of the hive like this? Why not go inside? I checked yesterday and there appear to be some left but they were very agitated when I took off the cover so I left them alone. I don't know if this hive is going to survive.