I have been using my ego-v v2 ever since last october and has been working good.Had been using a kanger mini protank 2 for about 3 months and changing the heads every 2 weeks.I started noticing that once i take a drag off it,most of the time i have to hit the button 5 times to turn it back on.Battery is fully charged most of the time and take like a 3 second hit from it.So just wondering does that sound like a head,tank or a problem with the v2? The tank is name brand and the head was the last one that came with the package.thanks