I just received my volcano inferno starter kit today. It came with a tube tank with the built in cartomizer. I primed the cartomizer, filled the tank, and it usually produces good vapor. However, sometimes I don't get as much if any vapor and my main question is: Is it supposed to make an occasional cracking sound? It does so whenever I push the button. Also, this question is specifically for this e cig, to activate/deactivate the device you have to push the button 5 times and it blinks a few times. When you activate it do you just push it once and then you're good to go? When I do that it mostly works, however sometimes it doesn't. Any suggestions?