Sims keep stopping/cancelling out their actions to do other things

It happend to me too, I ask the sim to cook food for her children, she goes and does something else 

Constantly! Stopping cooking to go watch TV

I also noticed this issue last night when I was playing. I told the butler to cook five different times. He started chopping, and then walks away to listen to music. This is extra annoying because I can’t drag anything to the trash or sink so all my spoiled ingredients are sitting around waiting for someone to clean them. 
None of my children stay in bed through the night. They get up with half full energy bars and go play on the doll house. 

I get this bug in a form that my sim keep cancelling things when I say they need to do other things. For instance stop eating if I have first said to them to eat and then take a shower after. My sim will drop their food and then go take a shower. But also cancel action when I switch between sims. So if I do something with my child sim I go back to the parent who I know should do something only to find out that they have not done said thing but just stood there waiting for something to occure. I play on PC and no mods or cc in my game. 

Same for me. The children and the infants wake up and play with the doll house at half full energy. I didn’t even know infants could play with doll houses. 

Same for me! I thought initially it was happening only when I opened build mode (even if I didn’t change anything or do anything that interferes with their current happenings) but it’s happening even when I’m actually playing as the sim too. I also used to be able to switch between the sims and give them all queues but now they pretty much disappear as soon as I move to the next sim.

I am also having this issue. I noticed it specifically with toilets and bookcases. I will queue up using the toilet and it keeps automatically cancelling. It doesn't show the 'I can't get there' or anything, just cancels. I tried moving the toilet around and same issue, eventually it works if I try queueing it up 3-5 times. 

Also, I tried using 'read something from multiple bookcases and it either cancelled automatically or it would sometimes have the 'I can't get there' even after moving the book case around so that there was nothing around it and moveobjects wasn't on.

For me they are not even doing other things, they sójust cancel it.

So I'm trying to play the 100 baby challenge but there are multiple problems, the sims won't do what i command them to do, amongst others. You really need to check it out because it makes the game unplayable.