Solved
Sims laying on the ground like they are dead..
After the latest patch (May 27th) sims will randomly fall on the ground and lay there like they are dead, but they are still breathing and if I reset them they stand up and do nothing for a long time...
Update: After deleting the fairies vs. witches mod the sims no longer have the eternal slumber moodlet so that was probably the cause of this error.
