A Nitecore charger is as good as it gets pretty much. Hard to believe thats the problem but anything electronic can fail pretty much. Ive been using mine for awhile and havent had any issues.
Yeah, and NO manufacturer is perfect as far as QC goes. I got a crappy Efest LUC a few days ago from my local B&M that simply would not charge my 26650s. Maybe a bad one that got past em and you just happened to be the (un)lucky one that ended up with it. As mentioned earlier, it does help to take a deep breath and a step back now and then. I would check the center pin and the firing button spring first and see if you can find the problem. If not then maybe take it down to your local vape shop and see if they'll take a look at it for you. Good luck!