Hey TheVomit, I think it could be natural aging: Towards the end of a plant's life cycle, especially in the late flowering phase, it is normal for some of the older, larger leaves to turn yellow, dry out and fall off as the plant puts its energy into flower production.
Or there are issues with the pH level of the water or the soil—this can lead to a nutrient lockout, where nutrients are present in the soil but cannot be absorbed by the plant. Therefore, I would check the pH levels and adjust them if necessary.
Or it’s simply not enough water and the plant is drying out. How often do you water and how much?
I wish you all the best for your grow.