Residential microwave installed over range has touchpad controls. Without anyone touching it or even in the room, it randomly enters digits when cooking or off. This was infrequent but now happens several times per day. It also turns itself on with nobody in the room. For example, will push 30+ to heat something for 30 seconds and after it starts cooking, the microwave will add 9 minutes to the cook time with nobody touching it. This has resulted in burnt food but no fire yet. However, since this has happened when we are not in the room and could happen when we are not home to stop it, we are concerned about a fire.