I play alot. Some days. When i decide to pick up the guitar im sitting with it for about 4 hours or something. Im just keeping them on the wall in my room? (my room is heat isolated, don't know if it has anything to do with it)

I have a Gibson Les Paul and 2 Epiphone Les Pauls. It happens to all of them. Maybe it's just my lame fingers sweating like crazy? It might be dirt yes.... I don't know. It pisses me :(