About 6 months ago I purchased a Samsung TV and was so impressed, my instinct was not to hesitate to for my next appliance purchase to be a Samsung. I was wrong. This microwave oven malfunctioned within the first hour. It continued to go on and off randomly. The only way to turn it off was to unplug the unit or open the door. Hitting the cancel or stop button did nothing. I went on line and found that this is a normal problem for this unit. Many others complained about the same issue There are you tube videos showing the oven going on and off by itself since 2014. Because I am of a curious nature, I put a glass of water in the oven to discover that when it turns itself on, the light goes on and the turntable turns, but there is no microwave energy that heats up the water. I also read that there is a feature called a deodorizing feature in the oven. The manual explains that the oven may run as long as 5 minutes (it just says the fan and makes no mention of the light and turntable) after the oven is used to clear it of odors. So, my guess is that the problem I experienced might be related to a malfunction of that feature, since it went on 3 hours after the oven was first used.. When the oven is OUT of warranty, people are told that their keypad or main board needs to be replaced to solve this problem. Since my problem began right out of the box, I was not about to purchase another Samsung Microwave Oven. I went on line to chat with Samsung and unlike my experiences with my Samsung TV, they were not at all helpful. They were telling me to unplug the oven and pllug it back in...duh.......and then suggested that perhaps I have a bad electrical outlet. Sorry, I don't buy that explanation. Also, I want to mention that if you purchase a microwave with a dark blue interior, you should have young eyes because the light is not very bright to be able to see well within this oven. So, stay tuned, I replaced it with a Panasonic and we'll see how that works. I want to recommend that the additional service policy is well worth it and Best Buy is the only place you should purchase a microwave oven. They were gracious and helpful and couldn't have been any nicer about the return process. Thank you Best Buy.