I don't know if this is a bug or a suggestion. I notice that if I put too many farms on a planet and the population gets too high that the moral on that planet bottoms out. However, if I remove a farm so my food production can't support such a large population then the very next turn my planet is down to a manageable population and everyone is happy again. Doesn't anyone wonder where all those people went? Don't they care? Maybe if I were running an 'evil' society they wouldn't but I was running a good one.
Anyway, just a thought.