Hey, sorry to hear you are having an issue. I did a quick search on your particular device and it looks like it fires from a range of 0.5-3.0 ohms. It can fire up to 25 watts or 8 volts, which ever it hits first. It also says you have an amp limit of 20. Someone correct me if I'm wrong.
The first thing to do would be to check the atomizer to make sure it is working properly like another member said.
This device seems similar to the istick, if this is the case you can up the resistance to get a better vape and better battery life. These types of devices do not work the best when the resistance on top is close to its minimum it can register. I think you would get a good vape with something 1.0-1.5ohms. Good luck.