Okay, it's been a while since I've been on, but I need some help. I'm comeback player, 17 years off the horn, 3 back on. Everything is coming back in shape nicely, but for some odd reason I can't seem to get through 2 lines of a piece without emptying my spit valve. Even at medium range/volume, after 6 measures or so you can hear the spit bubbles. Granted, I am playing on a different trumpet than I was years ago, but I never had problems like this. Anyone have any ideas on how to fix this? I've been told I'm full of hot air, but this seems like more than that.