He knows about the 510 issue. He is mailing out the control head with new caps to everyone that received theirs with paid shipping to mail the old head back. He didn't find the issue because he tried vivi novas and Kanger tanks. They all fit. He didn't try a high end atomizer. All the heads should ship tomorrow or Friday from what he told me. As far as the rocker switch goes, each part of the rocker sits on a separate button. I have no issues with mine. If one is more sensitive than the other that is the dna20 board issue not the device.