Have eaten there about 10 times. Only thing I remember being cold are the shakes and the salads.
Last time, in May, had a delicious cheeseburger. Love that place. Pure Disney magic to me.
If I were you, knowing that twice in a row your food arrived cold. I would have made a preemptive request with the waitress. Just mention that "the last two times we were here, our food arrived cold". I am sure that would have made a point for her to make sure yours' was piping hot.
Hope you return and enjoy the magic of such a uniquely themed restaurant.