I was heating up a cup of coffee a couple of weeks ago, and after about 20 seconds the oven started making a crinkling sound (like crinkling up a sheet of paper). Right after that, clouds of smoke poured into the microwave, and even more smoke came out of the back of the microwave oven. The odor was horrible, and the "taste" didn't leave my nostrils and lungs until the next day. The odor stayed in the kitchen for three days. I notified Panasonic, but they're taking their good old time about answering me. I have emphysema, and that cloud of smoke has just made it all the worse. I thought I would warn people about this. The smoke did not smell like burning wiring or insulation. It smelled poisonous--maybe like burning plastic. So far, Panasonic's response was for me to unplug the microwave and not use it. Good grief! I offered to send the microwave oven to Panasonic so they could inspect it and make sure that they corrected this deficiency before someone gets hurt. I can't imagine what would have happened if I had to heat something for five minutes and left the kitchen area. Panasonic assigned a case number to me and said they would evaluate my case in the order my problem was received. Two weeks later they sent me another e-mail asking for my phone number so they could contact me. I guess that, in another two weeks, Panasonic will send me another e-mail asking me to verify the phone number that I sent to them. This is dangerous stuff!