I am on my 4th Dna device and I always end up with the same problem starting with the vaporshark dna200 and also 2 custom dna 250s and my latest vaporized nomads dna 250 they all work great for about 4-6 months before they start the same problem, they stop charging at 2a and start charging at about 0.53- 0.59. With the vaporshark I sent it in for warranty and they just changed board and battery which I had to pay for then problem happened a few months later. and basically same story with the rest of my dna's. I bought my vaporized nomads dna 250 so I could just send it in to fiz anytime it happened but they are out of business but I don't really want to buy another when I have 4 sitting in a drawer