Hmmm. I think you have light getting in your grow area during off light hours, unless you're on 24hrs, that's the first thing to check for. I've had that happen because of the red light on the power strip. the best way to see if light is getting in is sit in the grow room for 15 minutes, till all the light in your eyes is gone and its just black. if you see the tiniest light coming in block it off.
P.S. even autos can go herrmie because of light being on during off hours. if you're on 24hrs then it could be anything.