So many times I go into a hot club and I see the players guitar case lying open in the hot dressing room. I find that keeping a case open will absorb all kinds of moisture and humidity. I would trying finding Desiccant packets that you can place in your guitar case to help remove some of the moisture. The Desiccant packets need to be dried from time to time to remove the absorbed moisture and they can be reused in the guitar case. Depending where you live and the average humidity at your location it is good to make sure your guitar case is pretty dry as the humidity can cause the pickups, hardware and controls to oxidize.