I was using it as normal and all of a sudden it blinked repeatedly for about 15 seconds which is longer then it usually does when it dies. I've had it charging for around an hour or two however when I took it off the charger to use it the button is not lighting up and I'm not getting any vapor. The charger is working fine, the light is green as I screw it in and when it is screwed in the light turns red. Is something wrong with it or does it just need to charge more.