from the looks of the pictures u posted i would say its a humidity issue. the cells of the leaves are getting damaged due to a high level of humidity, causing the leaves to dry out almost completely! feel the leaves that show these brown/yellow spots or marks, if the leaves feel crispy and dry put a cereal bowl in your grow area filled with pH balanced water, figure out a way to add some better ventilation to the room and make sure you are equipped with a fan to exhaust stale air out of the grow area and a fan to intake fresh air into your grow area. that should solve the problem if its a humidity issue. hope that'll help you, i encountered the same problem 4 weeks into flowering one of my girls. even though the plants leaves will be recieving moisture from the cereal bowl of water the damaged leaves will not return to health but the plant and other healthy leaves will!good luck homie!
