I am having a very big problem with my Provari. It works fine on a freshly charged battery until about 80% charge and then the button will only work for half a second and not work after that. The only solution is to unscrew the cap and and screw it back on. This usually only helps for a hot or few and then I'm right back to square one. I've put in a support ticket with Provari but never got a reply. As far as I know I am the only person with this problem so I don't think it's a qc issue. If anybody has a suggestion I am all ears as I am extremely happy with this particular pv. Thanks.