My once top of the pecking order rooster is now suddenly afraid and being chased by another rooster who uses to be way below him in order. He doesn't take his hens out anymore and stays to himself. He acts like this younger rooster is the scariest thing and runs screaming at just the sight of him. He's now fallen to the borrow of order seems like. He's even alittle spooked when I approach him. He goes foraging alone and that isn't like him. What could be wrong? He's about 3 years old . He still eats and drinks and loves his treats.