It's unclear if those saves can be saved at this point or what's causing the issue. Any input is welcome so please post in this thread if you have the issue.
Are you using custom content or mods in your game ? No
Do you have this issue only on a particular save game or on all of them ? All
Can you start a new game for testing purposes ok ? No
Do the backups of the saves work (Here's instructions how to access them) ? No
If they do, do they corrupt after a while too ?
Do you have any lastexception.txt files in documents\electronicarts\thesims4\ ? If so, please zip them up (all of them) and upload to mediafire or dropbox and post the link here. No media fire or Dropbox
If you are also willing to share your save games, please also zip them up and upload. If you don't want to share the links publicly, you can PM me, I'll pass them on.
Questions about your save game
Have you been switching families or played one ? Just one
Do you remember what careers/aspiration the Sims in your household were in ? Culinary, business
Are there children/teens in your family ? Pregnant sim
If you started a new game and had this issue, did you put in an older Sims family or completly start over from scratch ?
Anything else you think important (no rants please) ? EA really takes their time solving problems! But you are awesome
The only solution for now seems to be to remove the entire saves folder and start over.