fan leaves turning yellow and dying

Well you are getting close to the end of the season and close to harvesting. I don’t know what feeding schedule you’re on or what type of soil you’re in. But it’s probably a little hungry and if it doesn’t get fed nutrients it will start feeding on itself. So essentially it’s a last ditch effort at making the best flower possible before it dies. So as alarming as it looks, at the end of the day fan leaves are not the prize. So if you can maybe give it a feeding to tie it over until harvest or just ride it out. You look like you have some nice bud to harvest this year. Good job man. Enjoy!