same problem, looks like corsair f***ed up firmware or something with updates :@ this kinda works for me too, now just one fan is flickering from 4. using total of 6 LL120s but 4 had problem. I think just one fan is causing problem, if you have defective fan in chain that's problem
RMA your fans guys, I can't because of my living location and they can't send free one for sure.