Not with me. But this was with a 20 watt iStick and a Nano with the 1.2 ohm coil. After switching between the Subtank and my old Nautilus for about a week on it, all of a sudden I got a "no atomizer" alert out of nowhere. Put the Nautilus on it, same thing. Had to fiddle with the center pin and now it works correctly with the subtank, although it is reading at 1.1 on this particular coil for some reason. Anyway, I stopped switching tanks on it and that seemed to solve the problem with the ohms jumping around. It was definitely the mod though, not the tank. Maybe switching around tanks did it, but you should be able to use more than one tank/atty on a mod. Disappointing to hear this about the 50 watt because I thought they fixed these problems on the newer devices. I really don't want to have to buy batteries and a external charger and all that crap so I was going to go with the 50 watt so I could use my subtank and maybe get an RDA to try dripping on. Now I think I might be better off just spending the money on nicer device and leaving Eleaf alone. They are probably cheap for a reason. They always get glowing reviews though. But those are always out of the box, I feel like time goes on and these things break down quickly. I had my 20 watt for 3 months only before problems started. It is working now that I only use the subtank on it, and occasionally lift the center pin a bit, but that is annoying.