Sims 4 unplayable PS5 9.21.2021

@SheIsDahKing Your second issue sounds like this bug: Content not Installed when placing household from gallery. Please post there about that error message you are seeing and click the "Me Too" button at the bottom of the first post on the first page of the thread. This error is visual, and isn't removing anything from your sims or game.

For your main issue, there's a bug here Game Creating tons of Empty Households that affects the Cottage living world. This can cause your game save to become too large, and cause issues.

Otherwise, the lot you have downloaded is possibly just too big and too full of stuff for your console. Some of those lots are packed full of items and use every pack, and are just too much for the consoles to handle. When you are downloading lots from the online gallery, you must be mindful of how large and how cluttered they are. The cost of the lot is usually a good indicator of just how much stuff is packed into it.

Try removing the lot from your game and downloading a smaller lot for that space, and also check your households to see if you have a lot of empty households.