My electric cub cadet xt1 is fully charged. When I turn it on, press the throttle, it hesitate and then turns off. The cub cadet customer service rep told me to make sure the brake is off and check the seat switch. I did, as well as recalibrated. But now I think it's something with the brake because the mower won't roll at all. Someone please help. I can't find anything on this. Thanks!