April 2017
Let me just get this out there, my computer runs totally normal so I am pretty sure my computer has nothing to do with my problem.
I have been playing The Sims 4 for about a year, and after a couple of months of not playing it, I decided to go back on. Again, smooth gameplay, everything was fine, until I decided to go back on after a day or two, aka, today. When I went on, it welcomed me and introduced me to all of my gamepacks like I was just getting them. That was weird. I then see that apparently I have zero households, and nothing saved in the gallery! It was like I had never played the sims before.
The only thing normal was that I had the packs themselves and that it showed that I had played 150+ hours.
Please help, I have spent 150+ hours on this game and I really do not want to lose everything!
April 2017
Do you have something running like OneDrive that might be copying the files to a different location?
Also see: http://sims4.crinrict.com/en/2014/09/save-games-disappearing/