Why won't my sim sit still?

Yebb. This makes trying to finish aspiration tasks that has to take couple of hours in one sitting a bear. Even just to get one hour I have to watch my Sim like a hawk. I am also experiencing, with one of my robotics Sims, when she is working on the robotic table, in the livingroom where the tv is she is always cancelling her robotics to watch tv. I always have to cancel it when it comes up and if I am not fast enough, she will quit and head for the tv.

I have also noticed that Sims will quit conversations and go do something else. This is especially annoying when they have visitors over and I want them to get to know them.