Gallery Lots Crash Game

I play on PS5 and have quite a bit of DLC - all of the expansion packs, some stuff packs, kits and maker packs etc. My game storage is 98.69GB. Available console storage is 641GB. Plenty of storage available. 

I've recently (since updating to the latest patch at end of July) have noticed that placing particularly large lots 500kb+ from the gallery forces my game to crash. Not only that, but the gallery in general seems to be very slow and laggy. 

I went as far as to delete many lots and households that I have saved in my Library - there were a LOT. 

I've worked out - I can place lots unfurnished, but furnished crashes the game. 

Afterwards, I was able to finally place a 64x64 lot of 500kb+ size but STUPIDLY didn't save!! 

My console was powered off and nothing was saved. I've since tried to re-place the lot and every time I do, it crashes. 

I've recently bought a few more kits - nifty knitting and music den.

I can't seem to work out the root cause, but it's DRIVING ME BONKERS!

Please help! I just want a big lot that's fully furnished that I don't have to build 😭