Crashing In Live Mode

I switched from a PC to a Macbook Pro and I've had zero issues until the Reaper Rewards started. My game keeps crashing every single time I'm in Live Mode if I don't save every few minutes. It doesn't crash when I'm in CAS or when I'm in Build Mode - it crashes specifically in Live Mode and saves nothing. I've gotten rid of my mods and CC, I've repaired the game, I've opened new save files, and nothing's fixing it. I'm at a loss for what to do and how to fix it. This has been happening for the past four weeks.