Why does my Casio LK-165 keyboard turns off while iam playing?

While I am playing my Casio LK-165 keyboard it turns off automatically. Its suppose to turn off automatically when I am not playing it but not when I am playing it. Also when I press any key on it, it also turns off and sometimes it turns on for one second then turns off again. Also now it doesn’t want to turn on. I cant find a solution on the internet , please help I need it to work. Thank you.