So I have a tobeco clone and a zmax v5 blackout edition. The atomizer threaded beautifully at first, (I've had it for 7 days) then last two days it will not thread onto my mod. THreads look just fine, and the kayfun will screw onto my old ego battery. And my protanks screw on great to my zmax so I'm confused on why the threads wont connect with the kayfun and the zmax lately.