Wish you had a little better idea of flowering, but thats ok. I've come across with mine, that what i like to call the under leaves that don't get no light, that will sorta shed in a since and wilt off. I'm in my 5th week of flowering going into my 6th, and i usually find a few on the inside that are like that. Maybe there is a problem, but i really don't see it, according of what i'm seeing at the top of the plant. Just my opinion, maybe some of the more seasoned people willhave a better idea...