I have a 2 yo old hen going thru a molt that I'm watching this morning drops herself on her butt. She walks, eats readily with treats thrown to her, but every ten seconds or so, she's dropping to the ground then standing back up. Its not a 'submissive to a rooster' thing. This is something wrong. What could it be? Everything else appears normal. She's on a grower feed for the added protein, same as the others and theyre fine. thanks for any direction.