Very hot? very sunny? I would be careful and await further trial results.
Some appear to have had 'leaky' hives, in that somehow bees are getting behind the divider and not managing to return, so ending up dead. Certainly on my example there was a small gap beside the divider when I checked (I had a small colony confined to an area close to the entrance/exit) I found a gap after I re-housed the colony, for removal to another site (the colony, not the hive).
I have not checked further, since then, but intend to as I wish to over-winter a colony in my 'modified' beetainer. I have found it not quite so 'user-friendly', as a practical hive, as they might have you believe. This is compared to my wooden Dartingtons (the design from which the beehaus was developed).
The newer models do have some improvements over the older version.
I suspect, but have not yet observed, it
may be due to one of a couple of possible causes, if not there before I colonised it. It may be that the hive is 'distorting' in the heat - either due to: 1) uneven terrain causing a continual torsional force on the structure, or 2) differential expansion from one side to the other. in either case allowing the divider to no longer seal as effectively as it should.
It may only manifest itself as a problem when the divider is moved part-way along the hive. To add a little extra, the newest models appear to have a divider which will only fit at the centre line, thus (if this is the case, and in my view) making the hive far less useful as a horizontal hive, compared to it's orginal design concept, The Dartington Long Deep Hive.
See my thread 'Quick appraisal of the 'improved' beehaus'. Here is a link:
http://www.beekeepingforum.co.uk/showthread.php?t=6088
Regards, RAB