About a week ago i decided to upgrade from my ego style batteries to a subtank mini and an istick 40w. The subtank mini worked great on the ride home from the store but within an hour started leaking out of the air control collar. I brought it back to the store and they replaced the o rings and hoped that would fix it. It didn't lol. So another trip back to the store and they gave me a new subtank mini. I get this one home and the same thing is happening. I was using the .5 ohm coils in both so i tried the 1.2 coil hoping that would fix it. It was still leaking. So i took it apart and washed it with water and let it dry overnight. I put it back together and it was fine for a day or so but then it started leaking again. I have been using 50/50 and 70/30 vg/pg e juices. I have also noticed a gurgling sound that is often accompanied by by hot ejuice spitting into my mouth. Since I have had two doing the same things I was hoping that there is something I am doing wrong as when this tank does work, I do really like it. I have been using the k1 that I had before just fine on the same istick so I don't think it is the battery. If anyone could give me some advice, I would greatly appreciate it.