I have some 1.7 Resurrector's from crystal clear vaping, now they work great for me (most of the time) but now and then I get one that "pops" when-ever I take a drag (puff,toot, or what-ever..haha) and it leaks just a little from the battery end. I use these carto's in my tank mods, with my silver bullet or my K-go...My ?? is ..why does it do that ??? any answers would be great thanks.....JRL 
