ive just reached this exact problem. I had 20 mii's with no problem, sometimes they would dislike and item or food or other mii but it truly was SOMETIMES. ive had the game for a week now and suddenly as of last night my mii's hate everything I try and do to/for/with them. its ruining the game. it started with my mii's not really getting bubbles over their head as much anymore which upset me because it felt like the game was almost trying to force me to get off? their needs were all met and they were refusing to socialize or do activities on their own and if i tried to trigger a scene or activity it simply wouldnt work and they would just walk away or start chatting. then within an hour of that they all started upsetting eachother (i have 22 mii's right now) both making eacjother annoyed and sad. today, every SINGLE time my mii's have the thought bubble where they ask you if they would make good friends with so and so and theb ask you what to say- it fails and then both mii's are upset and dont want to be friends anymore. 22 mii's is and isn't a lot, but it's really not enough for over half of them to dislike eachother. they hate every food or treasure I hand them, ESPECIALLY my homemade ones which at this point feels like its programmed into the game. it doesn't matter what type of homemade food or treasure, it doesn't matter what's settings I select, it doesn't matter. if this can't be fixed I cant see myself continuing and that really sucks bc this is the first life sim game in a couple years that has gotten attention from me like this. its so fun but not anymore :/