How do you store it? Safe, case, under your bed? They make all kinds of things to take the humidity out of storage areas. I suggest getting it out and playing with it more often.
Also, don’t forget to clean the firing pin assembly.
Gave it a good cleaning. Barrel inside is spotless. Used foaming blaster, barrel blaster patches, and dry patches until all came back clean. Cleaned firing pin and rubbed it down with Flitz. Should do it good.