I experience this a lot my self. I think it has to do with hunting presure before and during season, at lease in my areas I hunt. Scouting is the key to help you out and me. I try an find the Boss Hen an piss her off and get her talking and some times it brings a Tom in, but its more fun with her being pissed off than having a Tom come in. They act just like a wife when they are Mad.