Dont worry man u aint the only one who has had this problem,,,,what i found is that there are just some strains that have hermmi tendancies,,, to avoid this issue stick with a farmiliar strain,,,run new strains thru there life cycle to see then clone off,,, as mentioned above light leaks will cause hermie tendancies ie: street lights, tree mounted cameras for hunting etc.....stress is much less of a problem,,, cannabis can endure extreme stressies as it is a weed,,, especially outdoors. one stress that garuntees hermmis is use of little n with alot of pk during the veg cycle