I'm using this: http://www.mistymountainvapors.com/510-Dual-Coil-Tank-Cartomizer-DCT.htm
For some reason, the last couple of cartos I've put in this thing won't stay wet. I do everything as I always do, I fill the tank, then make sure the carto is good and topped off, in several ways that were given to me here. But I'll vape for a few minutes and then suddenly get a dry hit. It seems like it isn't pulling juice in from the tank. I've tried changing the voltage on the Twist, I have used two different juices from two different vendors, and I have had this happen on 2 cartos back to back. I keep rewetting the cartos myself, and I'm good for a few minutes, then dry. I'm out of ideas on what could be causing this, and it is getting really annoying. Any ideas?