I play in a brass band, and last week, I played three outdoor shows in the summer heat, several hours each. In between gigs, somehow, the third valve on my Bach Strad (37) got stuck! Like, it would only go half way down!, AS if I was a kid that stuck a wad of sugary gum in the trumpet! after enough oiling, I got it to move, but realy freaky! Someone told me the humidity has an impact? Help!