I've had Nautilus tanks since Sept 2014. One by one my heads started failing, I thought they were giving up because they were too old. Bought at my local vape shop a new box of 1.8 ohm heads. Two heads I opened suddenly stopped working. Fiddled a little with the pole and boom, they started working. But, the problem is the pole! There's some sort of ring around the pole that looks rusted or something. I wish I could take pictures. But these heads aren't working in any of them. So I assume that the pole has rusted or it stopped making connection. The floating pole is way down, tried to supplement it with a little metal and pulling the positive up, but the result is the same on all three attys and 6 batteries, with 3 different heads from the same batch. I don't know if anyone has experienced this!