Lately my tone has started to suffer, I don't quite know whats going on. I've been doing long tones, lip slurs, and other exercises from arban, and books of that sort. All of a sudden my tone is really starting to decline. I decided to hold off on the practicing and heavy playing for now to make sure this odd change doesn't become a bad habit, or worse something permanent. I have been told im not breathing like I used to, which might be a problem, but im not sure. I decided that maybe getting a private instructor, even for just a single lesson, or two lessons, would be a good choice. I might possibly go longer, but would I benefit from this? Is it a good choice to not practice until this is figured out by a professional, or should I practice still?