I have 5 vivi nova's so far. One of the older versions and 4 of the new version (v2.5) I've changed heads and cleaned them before but this time I wound up with a new problem. I posted before that the tip of it was getting hot. Like in to hot to vape on. As a member suggested I cleaned it really good and replaced the head. Filled it up and let it soak for about 30 min. Put it on my vmax and the reading for a 2.4 ohm head was 3.2. Then it dropped to 2.2, then up to 3.0, then settled for 2.8. About an hour into it it changed to 2.5 and has stayed there so far. Once again the tip was getting hot. Any one else had this experience? I'm really thinking of going to just the mini's and smok titan. I said before that I liked the stardust but after having 2 of the tubes seperate from the base I'm searching elsewhere for my clearo's. I like the idea of the smok titan but I like the size of the mini nova's. The size of the stardust was perfect to carry in my pen pocket at work and I still have 5 of them and a bunch of heads so I'll continue to use em till they all break. I'm really not ruff on my pv's. Suggestions?