vaping great. Make sure the liquid is going down to the bottom of the filler in the cartridge (move it aside a bit with a toothpick). The 510 holds quite a bit in the filler, so be sure it is full, and that the polyfill is brought back up to the top of the cartridge so it is making good contact with the atomizer bridge.
Could just be as simple as time for a new battery, or perhaps you need to clean the brass connectors to the atty and battery. If that doesn't work, it could be flooded (I'd blow it out last after checking everything else first).