I keep my cigars at around 65% RH and the thing I have to focus on most is when I puff, nice slow draws but making sure that I see the wrapper staying lit. I smoke slow so my cigars have a tendency to stay lit at the core but not all the way to the outside edge/wrapper. This ends up letting my cigars tunnel and eventually go out. Next time you smoke take a look and see if you notice the edge of the wrapper burning...