In the past 6 months, I have ruined three mods - a Tesla, a Vamo V5, and now a sigelei Mini. Somehow, I keep stripping the threads on the connection. I've used an Aspire nautilus an all the mods. Does anyone else have this issue? It's strange because its not like the threads wear out over time that I notice. They will be fine, and then they won't be fine, and within a day, I can't get my tank to attach.