Here's a phenominon (or however one spells it).... Normally my playing is fine, good range for experience etc. etc. Yet there are just random days where I just play suck, my range is diminished like a whole octave, I'll be playing then all of the sudden all just comes out is air, just bad news the whole... I know you can't crawl into my head, but any explanations/ theories on how to solve this?