I generally skim a bunch if content on here, I'm not much of a reader... I'm more of a picture guy, for sure. But, somehow this caught my eye!
Sugar leaves, fan leaves, and SACK leaves. LoL
These plants always seem to bounce right back as long as we're paying attention. My guess on the sack leaves would either be overwatering, or moisture collecting between the surface of the soil and the lowest leaves.
I had a plant awhile ago that was very thick as a seedling. The lowest leaves created a lid over the solo cup... trapping moisture in.
I had up-potted, thinking she was root bound, but looking back on it, it made sense. That cup always dried out slower than the rest.
Not sure if I'm being helpful, or just jaw-jackin' but figured I'd throw in my .02
*edit: just went back to read a bit more... guess I was just jaw-jackin' lol
Maybe it will help someone else along the way.
LoL