First off had a power out-age for 4-5 hrs. about have way thru the incubation period. Covered 'bator to insulate it so was still warm. Out of the few chicks that did hatch have had several that seemed "top-heavy" and couldn't stand but would roll over on their back and die within a couple of hours. One survivor has curled toes on one foot but is otherwise fine and eating. Would the power failure cause these problems or something else to blame? Any input appreciated!!