innanimate objects not loading (invisible)

During my gameplay, I'll load onto my home lot, for example, and only half the furniture in my living room is there. The rest is invisible and unclickable. Loading times vary between 10s-3min. Sims don't load visibly so my sim looks like she's speaking with herself. She will be cooking nothing at all on the stove, and putting a fork into thin air on the table when eating. It's happening all the time. I use macbook.