The front entrance of my residence is two years old. The door is warping and checking badly. I was informed that the finish is a water based polyurethane coating. The door is made of mahogany, is 2.25" thick, and is 41" by 8'. I feel the door is beyond salvation. The home is in Nevada. What should I specify for the next door so it can last more than two years? Any and all suggestions are appreciated.