I will say, the bees have become VERY active. They act like it's the middle of summer, seeing them coming and going. Plus, they've been drinking from the bird bath by the dozens, like they never have before. They've also become pretty defensive, too, unusually so, and they've been dragging lots of drones, dead bees and pupae out of the hive. It's like they were lethargic for the past month and then came back to life. There's just so much going on around the hive that I don't know what is significant and what is not. But I'll take the steps that you all have suggested, and see if that changes things.