Had to make this account and try to help people out because there was not a good solution for this I could find online currently. I had this problem shortly after getting my Vaporesso Revenger mini mod. After reading similar problems online, I tried cleaning all threads in the tank and coil and reassembling. I also read that a lot of people were saying make sure everything isn't screwed too tightly. I even called the shop i got it from and the dude just said it was a faulty coil. All wrong. What fixed it for me (and hasn't happened since) was making sure the tank was screwed into the mod tight enough (just slightly passed the natural tension). You can tell when it's tight enough because the resistance will read close to what your specific coil resistance is supposed to be. This most commonly happens when switching to new coils or removing the tank for anything. Good luck.