I've noticed this with one of mine today. Removed it, blew it out and couple of hard draws later it was working well again. Not sure if I'm doing something to cause it, or if it just happens....
Just got started this weekend with an eGo battery and Clearomizers. Already trying to figure out what is next. Hope to learn a lot here!
I am trying to get off cigs as well, so I have that motivation on top of enjoying vaping.