I feel like my horn needs to constantly be fixed! When I get it back from the repairman, it sounds great, feels great, but maybe a month after that, it feels like there are some leaks in there, extra airiness around the horn. Is this normal? Is there some way I can prevent this? My horn is a Yamaha - 62 II tenor, and I've had it for a year and a half. It's in a protec contoured case, and I'm quite careful with it, although it might get a few bumps on the bus every now and then. How often should I be bringing my sax for maintenance?