My humble $0.02,,,,,, how often do you open the humidor, if daily that could be the problem,,, if you are taking daily smokes out the humidity wouldn't balance. The second thought is the location, I read it was a three tier, pretty piece and set out for show, might be better to place it in a less traveled area or closet to balance the room fluctuations... I know I had a few the tunneled as I was using the big coolidor to smoke from rather than my little hard case,,,I stopped and open it once a week or two and the coolidor is great now, I take from it my weekly smokes and haven't had a problem so far