I haven't had any problem with mine, but I did make sure there was something in the bowl. I have started making the bowl potholders out of the quilted fabric. The one with the foam in between the layers. I was worried about the foam, but have cooked the water up to 6 minutes and have had no problem. I have a large, new microwave above my stove, so it is powerful. My mother-in-law loves the one I made her. She said it is the best thing I have ever made.