So I have been using my subtank mini for the last two weeks fine no problems, outstanding vape. Just used stock coils. All of a sudden I get check atomizer from my dna 40. Thought coil was dead put on a new one but same thing. Tried it on a yihi device and it fired but ohms jumping all over the map. Tried rba section..same thing. Thoroughly cleaned the connections on the mini in a hot bath and cleaned my device pins. No change. What is going on? Did I get a dud or is there anyone out there with this issue?