I had a past customer just leave me a voicemail regarding the micro-cooker. She said that she has used it 2 times and she is not happy because the lid doesn't fit tightly on it and it has made a mess in her microwave each time she's used it. Any suggestions on this product and how to use it and not make a mess? I don't have one and am not sure how to give her tips if I haven't used it myself. Thanks!