This has been happening to me too. I only recently downloaded TS2 Legacy and have been playing with another version on my previous computer. I use mostly same CC and mods as before, and have never had this problem in my previous game where I was in gen ~15 of my meganeighborhood and used to play for hours without a problem. It was in Strangetown too, which is notorious for its corruption.
Now I can't get through even half of a round in a 5-household rotation before this crash happens. The neighborhood is fully custom one and game runs otherwise quite smoothly, so I'm pretty sure the problem's not on my end.
How often is the game crashing? Sims 2 has always crashed somewhat randomly. The "work around" has always been to save frequently, quit at the 1 hour mark (maybe 2 if you already cleared cache files once), delete all the cache files, then start up again. Then it will generally run fine for another hour or more.
All that said, if you try that and it's still crashing frequently, and you can't even play an hour, then it's probably something else.
