Placed Lots Cause Endless Loading

Hey Moochellie​ I think what you are experiencing with the empty lots that shouldn't be empty could be this issue, maybe upvote that one as well if it looks like yours: Neighboring Houses show as Default/Empty | EA Forums - 11903590 

Are you by any chance playing in a save where you have build-up a lot of the lots of your worlds (like close to all?)? Or are you playing with residential rentals?

I also just this week reached a state in my main save where lots are defaulting to empty or default houses, and wonder if everyone who has all packs and built-up all available lots will reach a similar point in their games, because the game may not be able to store the amount of lots we now have with our numerous worlds..