I had the same thing happen and when I read about his little porch loafers, I
went into the one hive (the other four were okay), and took two of the ten
frames out because the rest were so full of brood and honey that the
foundation in the one frame I took out had warped badly from the heat.  I
took one of the ten frames on the second deep super on top of it that was not
as closely packed.  So far, so good.  It has not been quite as warm since I
did that, but even when it was not quite so hot before, the bees were hanging
onto each other outside the hive almost like they were preparing to swarm.
 With two supers on top of the two deep ones, I thought that would be odd and
I'm glad the problem was posted and you gave such a good answer.  They should
be enjoying some improved ventilation with the remodel on the frames. Thank
you.  Beverly