I've begun noticing that my favorite brush (Semogue 2011 limited edition) has started to shed a few bristles daily and become a little limp after just about daily use (6-7 days a week). I've had it for about a year and didn't notice any change until about a month ago. I always thoroughly flick it dry, never submerse. I do store it bristles up though. Is this normal? Anyway to bring it back to life? Vacation perhaps?