I can't see any obvious issues from the pic, but a plant that is restricted to a small pot and strong indoor lighting can grow fast and tall like yours and puts out huge leaves.
When mother nature and conditions are right it wants to produce more growth and begin flower production.
This ends up is over sized droopy leaves like yours as they are the oldest on the plant while it concentrates all it's energy into the new growth etc.
Over watering is one of the most common problems as well and could also be an issue.