My goes is pH has been jumping up and down. Have you been adding things as you go along or stopped supplying the plant with anything you used to add?
Gotta post far more information about your operation. Temps, feeding schedule, nutrient line, medium, humidity, whether or not you monitor ph or EC of nutrients/run off. Bham Sent from my iPhone using Grasscity Forum
Overfeeding and now you have salt lockout which has your pH too high. That is my "guess" based on the info.
Temps are gnarly up to 95 but its because I swapped my LED for veg to my 600w HPS for flower when I took the pics the temp was a steady 65, I'm using a hempy bucket with alil coco and a whole lot of perlite, nutrients I'm using GH ph perfect and calmag ten ml of each my ph is always a solid 5.5 but the run off drops down to 4.0 shitts wierd I feed ever three days