I've found this out in maybe 4 days. If you have updated all your MODS, repaired your game, uninstalled and reinstalled the game and its still crashing in b/b mode try this. Run your Sims 4 game as usual and once the start menu pops up go to Game Options. Under there it should say Direct9 somewhere with a blank box next to it. Click it and a check will appear. Restart the Sims 4 game and repair it. Give it a couple of mins and it shouldn't crash anymore.
P.S I kind of figured the recent game update was the problem once it switched to Direct11. So switching back made it run smooth again. Also make sure your game settings isn't on Ultra. Mine was for some reason and i switched it back to High, no problems since.
I am going to try this out! Hopefully it helps. Thank you for the tip!!
