Issue
The save game starts to disintegrate itself. Lots start to get deleted, causing endless loading, loading into empty lots.
This happens to save games that have lots of R-rental units in all ...
Ideas
Unfortunately no. This bug happened before the Rent DLC. There were exclamation mark above the lot for no reason. Usually starts in Willow Creek then spreads quickly if you click on the lot. The whole neighborhood will sometimes go back to the default lots and will sometime throw Error 800/801 OR infinite loading screens. A few updates ago, EA/Maxis decided to remove the exclamation marks leaving players baffled. One of the EA employees said he would look look into but never did. This bug remains the biggest if not a game destroying bug.
Dang, that's scary. My save is as old as TS4. Of course I have backups, but still. This sounds like a TS4 apocalyptic bug. Completely destroys the whole TS4 world!