My trainwreck is starting to do this as well. Mine is worse, though. The leaves on top are starting to get red edges and dry out a bit. I've clipped one of the dried leaves, raised my halogen bulb thinking that it was too much heat, transplanted thinking the soil was depleted, and tonight I moved my plant to a warmer area without the halogen. It's going to be much warmer where it is now, and it will only have a fluorescent aimed top-down. I'll let you know what happens, but my guess is that it won't survive.
Link to my thread:
https://www.rollitup.org/marijuana-plant-problems/281376-leaves-curling-little-dry-burned.html