I had this happen to me this grow. I watered with recharge and did a TDS measurment on going in and runoff to see how much nutes were in there. I did not have lockout and adjusted my nutes up to where she was being fed properly. Found out this lady was hungry! Like CPW said I added more nitrogen and she rebounded great. I also started out feeding her less than what my chart called for. I guess my nutrient companies feed chart with autos in amended soil was spot on . So now I use as directed. lol

Good Luck hope you turn her around!