Game says expansion packs aren't there

I've been having this issue for about 2 months now. It kind of happens randomly. I'll play the game fine one day and then the next, it says I don't have the right expansion packs downloaded to play that save file. I exit the game and repair and all is good. But why is it happening? I don't want to have to repair my game every other day because the game can't recognize all the packs I have. I don't even have that many. Not sure if it's a bug or something with my computer updating and Sims not catching up. Any help is appreciated!