I recently moved into 2 yr old house with Weather King (made by Ruud or Rheem?) 92% forced air furnace. The basement is unfinished & I have noticed supply ductwork popping, apparently due to expansion/contraction, on heatup & cooldown. This wakes me in the middle of the night. I would like to remedy this annoyance before finishing the basement. Posted answers mention S-lock, cross breaking, & possible insufficient return air. What does this mean, & what other methods can I use to solve this?