I have this exact same problem. It started with some blue dream clones i brought in from a club, they did fine for the first couple weeks, then this curling droopy shit came in. and then it spread to my other strains. i have been dealing with this issue for 3 months now. no matter what i do, hydro with coco, rockwool, or soil, i keep getting it, ESPECIALLY with the blue drean, seems to be extra susceptible to it. I do not think its something we are doing wrong because I have been growing these plants so many different ways and there is not one consistent factor. I'm happy im not the only one with this problem. I think its a relatively new disease that people are just starting to deal with and we dont know what it is yet. praying for a cure, this stuff is nasty! and contagious!