I have a Lopi Cape Cod cast iron stove. I have used several wood stoves up the hollers of Kentucky over the years. I’m familiar with the heating and cooling sounds of stove heating or cooling, and the sounds of logs making popping sounds. The lone single pop sound I hear is coming from the stove itself, and is always several minutes apart. It always comes from the same side of the stove. It happens even if the firebox is at a steady temp. Any ideas what this can be?