I have a 22 yr old Amana Fridge with Freezer on top, and there is no ice maker nor door water/ice cube function. It was a really great, quiet unit for many years until about one year ago. Started to make loud popping sounds once in a while, but know it's many times during the day and night, sometimes really loud. Seems like they come from the back of the unit. The sound is kind of like an electrical pop. My Freezer is no longer maintaining it's temp, as I find some items, like ice cream, have melted a little. I know my old unit is dying, and needs to be replaced. But that costs money. My concern is - if the sound is due to something electrical, can the unit malfunction and cause a fire??