Sims suddenly just stand there idle

I am having not the exact same but a similar issue. Since some time my sims started to stay idle and wait for hours before starting their next action. Like i.e I command my sim to prepare a meal, she wents and stands in front of the fridge for a while, takes the food out, goes to the counter and places the cutting board, she stands there for an hour and she places the ingredients, then waits again before starting to prepare it.... this goes on like this. Same with eating, cleaning, showering, gardening anythink you can think of.