For the past few days it has been very hot here on the New Jersey/Pennsylvania border. I have two hives one of which is not doing well (that's another story) and one hive that is doing fantastically well. For the past few days, the bees in the “good” hive have been coming out of the hive and basically resting on the front wall and landing board (1,000s of bees). I almost get the impression that they're coming out of the hive to cool off (sort of like sitting out on the front porch). Is this common or is this a sign of a potential problem?