We have two hives one that was quite strong, the other one not so much. It would appear that we seem to have lots of dead bees lately on the strong hive (30-50 bees over a couple of days). They really have been cleaning house. The weaker hive we would be lucky if there were 3-4 dead ones on the landing board. Is this something that should concern us or are they just dying off on there natural cycle. Thanks in advance.