Hi. I have a kenmore 1988 dehumidifier that still works great, no problems what so ever except for the other day i noticed when its left on for an extended period of time the plug gets warm, not hot. I read warm is normal, but others say its not normal and that there could be a loose connection, upon checking the pins on the plug theres no evidence of corrosion or stains or anything.. Is it normal for the plug to get warm?