If you have an older version of the save try going back to that copy and see if everything is back to normal.
I've experienced random game corruption in the past myself, although it is rare, but going back to an old save from before the corruption occured seems to be the only thing that will fix it.
Also as a bit of advice, and you may already do this but I figured I'd add just in case you don't: don't keep saving over the same save over and over again. I like to periodically, at least once every couple days do a "Save As" instead of overwriting the same save. I also back up my saves every so often in case of situations like this.
Edit to add: Maybe try a game repair before reverting back to an old save.
Step 1. Rename The Sims4 folder to "The Sims4 old"
Step 2. Fix the game in Origin
Origin/Library - right-click on TS4 - option "Repair game"
You have to wait until Origin will fix all packs, not only the base game.
Step 3. Turn on the game - a new game folder will be created and you will have two - one old, one new
Step 4. Check if you still have this problem in the newly created game folder.
If the problem disappeared
Step 5. Delete in the new game folder following folders:
"saves" and Tray.
Step 6. Go to "The Sims 4 old" folder and copy - your "saves " folder.
Step. 7, Paste this folder in a newly created game folder.
Step 8. Do the same with Tray folder and TrayDeleteItems file
Check if your game if working properly now with the old save
If yes:
Step 9. Check if there are newly updated version mods you are using.
Then copy and paste your mods and CC from old mods folder to the new one. First copy the scripts mods every time checking if the game is working properly. If you have a lot of CC try 50/50 method ( divide your CC into smaller batches for example 50 pieces in one subfolder and check these subfolders one by one)
The last step - delete The Sims4 old folder.
Your saves and library will be not changed or damaged
However, it may happen that although the new saves will not have this error anymore, the old save will remain damaged. Then, as advised above the only way, is to go back to the earlier save
By the way. If it will be work save the game option "Save as .. number " - not "Save and Quit".Then you'll always have the easy option of going back to your earlier save
I don't work for EA
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