curiousjoey1 One known cause of the currently very common error 123 is trying to load a lot where an event is happening. Here's the master thread for this error code:
https://answers.ea.com/t5/Bug-Reports/UNDER-INVESTIGATION-Game-Failed-to-Load-Error-Code-123/td-p/13898427
At least some of the time, the lot can be fixed (or fixes itself) once the event ends. I realize that that doesn't help if you want your sims to experience the events, but it seems like there's no good workaround other than skipping them. If the events matter to you, keep an eye on that thread for updates or suggestions.