Hi
@S_Dubz, nice monsters in here! I think there's nothing to worry about, your plant seems to be auto-regulating its system, by getting rid of the leaves that can't get enough light. Lower leaves often fall by themselves especially after the preflowering stage where Nitrogen consumption was at its peak. Let's see how this goes with time but if it's only the lower leaves, do not panic, let the lower parts breath and make sure the whole plant has a good airflow. Let me know in the comments section if you need any further information, and happy growing! 👊