What do the reports say? The reasons could be very different: hunger (buy some food), toxicity (your slaves drank too many potions: negative effects may last for a few days), high stress (cast sedation/dream on them before the day ends), hygiene (clean the mansion and appoint someone as maid).
That's the thing, there's no negative events happening in the reports. The mansion is clean. I'm praising away any stress as soon as it comes up. I keep up plenty of food stores. No one is complaining about luxury. No one feels sexually neglected. I'm meeting *every* need that there's feedback for.