A Problem with Following Commands

Hello,
Since The Sims 4 was released, there has been a problem with Sims not following commands. When I queue up actions for my Sim, they often just cancel them. In previous versions of the game, when you assigned tasks to a Sim, they would complete them one by one.
I often see my Sims standing around, smiling and looking into space, even with the time accelerated. After a long time, they finally start an action, or my commands just disappear from the queue.
Please fix this.
Thank you.