My house was constructed 3+ years ago. Over this time the house has settled to the point where drywall has cracked from the top corner of a doorway approximately 2 feet. Now another crack has developed at the upper corner of another doorway and I'm beginning to wonder if I should consider having additional support provided in this region of the home. I'm just not certain how critical (do something immediate or maybe wait) this situation is. Any suggestions would be appreciated.