My desktop does the same thing during the winter. I haven't checked the humidity in the house, but it's low. Do you have a humidifier on your furnace? I've got one on mine, but I can never tell if it's doing any good or not. Just a thought. I broke down and bought a handful of 65% Bovedas, and threw them into a 52 qt Igloo cooler with a bowl of water. Put all of my cigar boxes and my desktop in there also. It was at 70% last night after a week